My private herbarium comprises ca. 18'000 specimens, mainly lichens and lichenicolous fungi, including over 2'500 specimens from south-eastern Asia (mainly Papua New Guinea and the Philippines).
 

List of type specimens
(last updated 1 July 2006)

Lichenized ascomycetes

Anzia isidiolenta Diederich & Sipman (topotypus)
Anzia pseudopustulata Sipman (topotypus)
Baeomyces marginalis Sipman & Aptroot (topotypus)
Bacidia nivalis Follmann (isotypus)
Bactrospora acicularis (Dodge) Egea & Torrente (topotypus)
Buellia analgifera Aptroot & Diederich (topotypus)
Buellia manamiana Diederich (isotypus)
Buellia submuriformis Aptroot & Diederich (isotypus)
Byssoloma arboricola Sérus. & Aptroot (isotypus)
Byssoloma diederichii Sérus. (topotypus)
Calathaspis devexa M. Lamb & W. A. Weber (topotypus)
Dimerella frederici Kalb (isotypus)
Gymnographopsis chilena Dodge (isotypus)
Lecanographa laingiana Diederich, Egea & Sipman (isotypus)
Lecanographa subdryophila (Follmann & Vezda) Egea & Torrente (isotypus)
Lepraria flavescens Cl. Roux & Tønsberg (topotypus)
Lepraria leprolomopsis Diederich & Sérus. (isotypus)
Lepraria nigrocincta Diederich, Sérus. & Aptroot (isotypus)
Leptogium montis-wilhelmii Diederich & Sipman (topotypus)
Menegazzia efflorescens P. James, Aptroot, Sérus. & Diederich (topotypus)
Opegrapha follmannii Dodge (isotypus)
Parmeliella foliicola Jørgensen (isotypus)
Pertusaria culbersonii Vezda (isotypus)
Pertusaria subsorodes Elix & A. W. Archer (topotypus)
Phaeographina buxi Etayo (isotypus, topotypus)
Physcia vermifera Aptroot & Sipman (topotypus)
Placidium lacinulatum var. atrans Breuss (isotypes)
Porina gaumae Aptroot & Sipman (topotypus)
Protoparmelia isidiata Diederich, Aptroot & Sérus. (topotypus)
Protoparmelia pulchra Diederich, Aptroot & Sérus. (topotypus)
Protoparmelia hypotremella van Herk, Spier & Wirth (isotypus)
Psoroma pannarioides Aptroot & Diederich (isotypus)
Pyrrhospora aurantiaca Aptroot & Diederich (topotypus)
Pyrrhospora gowardiana Spribille & Hauck (isotypus)
Pyrenula ciliata Aptroot (isotypus)
Pyrenula kakouettae Sérus. & Diederich (topotypus)
Reichlingia leopoldii Diederich & Scheidegger (isotypus)
Rimularia globulispora Sipman & Aptroot (topotypus)
Rinodina albosorediata Aptroot, Diederich & Sérus. (isotypus)
Rinodina brandii Giralt & van den Boom (isotypus)
Roccellinastrum epiphyllum Henss. & Vobis (topotypus)
Sarrameana septata (Sipman & Aptroot) (topotypus)
Stereocaulon brassii M. Lamb (topotypus)
Stereocaulon staufferi Frey (topotypus)
Stereocaulon vesuvianum Pers. (topotypus)
Thamnochrolechia verticillata Aptroot & Sipman (topotypus)
Thelopsis byssoidea Diederich (isotypus)
Verrucaria sorbinea Breuss (isotypus)  

Lichenicolous ascomycetes

Abrothallus acetabuli Diederich (isotypus)
Abrothallus pezizicola Diederich & R. C. Harris (isotypus)
Arthonia arthoniicola Diederich & Aptroot (isotypus)
Arthonia flavicantis Wedin & Hafellner (isotypus)
Arthonia follmanniana Diederich (isotypus)
Arthonia pantherina Etayo (isotypus)
Arthonia rimeliicola Diederich (isotypus)
Arthophacopsis parmeliarum Hafellner (isotypus)
Biciliopsis leptogiicola Diederich (isotypus)
Capronia baeomycetis Diederich (topotypus)
Capronia hypotrachynae Etayo & Diederich (isotypus)
Capronia pseudonormandinae Diederich (isotypus)
Carbonea herteliana Hafellner & Matzer (isotypus)
Dactylospora microspora Etayo (isotypus)
Echinodiscus lesdainii (Vouaux) Etayo & Diederich (isoneotypus)
Encephalographa anthracothecii Diederich (isotypus)
Endococcus protoblasteniae Diederich (isotypus)
Enterographa punctata Ertz & Diederich (isotypus)
Gelatinopsis leptogii Ertz & Diederich (isotypus)
Gelatinopsis roccellae Etayo, Paz & Diederich
Gyalideopsis floridae Etayo & Diederich (isotypus)
Hemigrapha atlantica Diederich & Wedin (isotypus)
Hemigrapha nephromatis Wedin & Diederich (isotypus)
Hemigrapha pseudocyphellariae Diederich & Wedin (isotypus)
Lichenochora clauzadei Nav.-Ros., Cl. Roux & Llimona (isotypus)
Lichenochora gahavisukae Diederich (isotypus)
Lichenopeltella heterodermiae Diederich (topotypus)
Lichenopeltella hydrophila R. Sant. (isotypus)
Lichenopeltella hypogymniae Diederich (isotypus)
Lichenopeltella hypotrachynae Diederich (isotypus)
Lichenopeltella megalosporae Diederich (isotypus)
Lichenopeltella microspora Diederich (isotypus)
Lichenopeltella pannariacearum Diederich (isotypus)
Lichenopeltella physciae Diederich (isotypus)
Lichenopeltella pseudocyphellariae Diederich (isotypus)
Lichenopeltella ramalinae Etayo & Diederich (isotypus)
Lichenopeltella thamnoliae R. Sant. ined. (isotypus)
Lichenopeltella thelidii Diederich (isotypus)
Lichenostigma semiimmersa Hafellner (isotypus)
Llimoniella pubescens Etayo & Diederich (isotypus)
Llimoniella pyrenulae Diederich & Etayo (isotypus)
Muellerella lecanactidis Diederich & van den Boom (isotypus)
Nectria brutia Diederich & Puntillo (isotypus)
Nectriopsis coccocarpiae Diederich (isotypus)
Nectriopsis collematis Diederich (isotypus)
Nectriopsis leptogii Diederich (isotypus)
Niesslia lobariae Etayo & Diederich (isotypus)
Odontotrema intermedium Diederich, Zhurb. & Etayo (isotypus)
Odontotrema ochrolechiae Diederich, Holien & Zhurb. (isotypus)
Odontotrema rhizocarpicola Zhurb., Diederich & Himelbrant (isotypus)
Odontotrema santessonii Zhurb., Etayo & Diederich (isotypus)
Opegrapha blakii Ertz & Diederich (isotypus)
Opegrapha cladoniicola Ertz & Diederich (isotypus)
Opegrapha encephalographoidea Diederich & Aptroot (isotypus)
Opegrapha plectocarpoidea Diederich (isotypus)
Paralethariicola aspiciliae Calatayud, Etayo & Diederich (isotypus)
Parapyrenis lichenicola Aptroot & Diederich (isotypus)
Phacopsis doerfeltii Alstrup & Scholz (isotypus)
Phacopsis falcispora Triebel & Rambold var. sipmanii Diederich & Triebel (isotypus)
Phacopsis lethariellae Hafellner & Rambold (isotypus)
Plectocarpon coppinsii Ertz & Diederich (isotypus)
Plectocarpon cristalliferum Christnach, Ertz & Diederich (isotypus)
Plectocarpon lambinonii Diederich & Etayo (isotypus)
Plectocarpon macaronesiae Diederich, Etayo & Sérus. (isotypus)
Plectocarpon opegraphoideum Christnach, Ertz, Diederich & Wedin (isotypus)
Plectocarpon peltigerae Zhurb., Ertz, Diederich & Miadl. (isotypus)
Plectocarpon pseudocyphellariae Diederich (isotypus)
Plectocarpon sampaianae Diederich & Etayo (isotypus)
Plectocarpon scrobiculatae Diederich & Etayo (isotypus)
Plectocarpon serusiauxii Ertz & Diederich (isotypus)
Plectocarpon sticticola Ertz, Wedin & Diederich (isotypus)
Plectocarpon usneae Diederich & Etayo (isotypus)
Polycoccum cladoniae Diederich & Hawksw. (isotypus)
Polycoccum evae Calatayud & Rico (isotypus)
Polycoccum microcarpum Diederich & Etayo (isotypus)
Polycoccum montis-wilhelmii Diederich (isotypus)
Polycoccum tinantii Diederich (holotypus in LUX)
Pronectria terrestris Lowen & Diederich (isotypus)
Rhymbocarpus pertusariae Diederich, Zhurb. & Etayo (isotypus)
Roselliniella africana Diederich (isotypus, topotypus)
Schismatomma physconiicola Ertz & Diederich (isotypus)
Unguiculariopsis acrocordiae (Diederich) Diederich & Etayo (isotypus) [= Skyttea acrocordiae Diederich]
Skyttea caesii Diederich & Etayo (isotypus)
Skyttea hawksworthii Diederich (isotypus)
Skyttea mayrhoferi Diederich & Etayo (topotypus)
Skyttea megalosporae Etayo & Diederich (isotypus)
Skyttea tavaresae R. Sant., Etayo & Diederich (isotypus)
Sphaerellothecium gallowayi Diederich (isotypus)
Sphaerellothecium parmeliae Diederich & Etayo (isotypus, topotypus)
Stigmidium icmadophilae R. Sant. (isotypus) 

Lichenicolous anamorphic ascomycetes

Bispora lichenum Diederich (isotypus)
Cladoniicola staurospora Diederich, van den Boom & Aptroot (isotypus)
Clauzadeomyces verrucosus Diederich (isotypus)
Coniambigua phaeographidis Etayo & Diederich (topotypus)
Cornutispora triangularis Diederich & Etayo (isotypus)
Epicladonia stenospora (Harm.) D. Hawksw. (isoneotypus)
Feltgeniomyces luxemburgensis Diederich (isotypus)
Feltgeniomyces uniseptatus Diederich (isotypus)
Hainesia pertusariae Etayo & Diederich (isotypus)
Kalchbrenneriella cyanescens (Kalchbr.) Diederich & M. S. Christ. (isoneotypus) [= Torula cyanescens Kalchbr.]
Karsteniomyces llimonae Boqueras & Diederich (isotypus)
Lawalreea lecanorae Diederich (isotypus)
Lichenobactridium pertusariae Diederich & Etayo (isotypus)
Lichenoconium reichlinglii Diederich (isotypus, topotypus)
Lichenodiplis dendrographae Diederich & van den Boom (isotypus)
Lichenodiplis hawksworthii Berger & Diederich (isotypus)
Lichenodiplis pertusariicola (Nyl.) Diederich (topotypus) [= Spilomium pertusariicola Nyl.]
Milospium deslooveri Diederich & Sérus. (isotypus)
Mixtoconidium canariense Etayo (isotypus)
Monodictys epilepraria Kukwa & Diederich (isotypus)
Phoma lecanorina Diederich (isotypus)
Phoma lobariae Diederich & Etayo (isotypus, topotypus)
Pycnopsammina lobariae Diederich & Etayo (isotypus)
Pyrenochaeta xanthoriae Diederich (isotypus)
Sclerococcum epiphytorum Diederich (isotypus)
Sclerococcum griseisporodochium Etayo (isotypus)
Sclerococcum leuckertii Diederich & Scholz (isotypus)
Sclerococcum normandinae Diederich & Etayo (isotypus)
Sclerococcum serusiauxii Boqueras & Diederich (isotypus)
Spilodochium parmotrematis Diederich & Etayo (isotypus)
Stromatopogon cladoniae Diederich & Sérus. (isotypus)
Taeniolella beschiana Diederich (isotypus)
Taeniolella chrysothricis Diederich (isotypus)
Taeniolella rolfii Diederich & Zhurbenko (isotypus)
Taeniolella serusiauxii Diederich (isotypus)
Taeniolella trapeliopseos Diederich (isotypus)

Other ascomycetes

Parapyrenis maritima Aptroot (topotypus) 

Lichenicolous basidiomycetes

Cystobasidium hypogymniicola Diederich & Ahti (isotypus)
Cystobasidium usneicola Diederich & Alstrup (isotypus)
Marchandiobasidium aurantiacum Diederich & Schultheis (isotypus)
Syzygospora bachmannii Diederich & M. S. Christ. (isotypus)
Syzygospora parmeliicola Diederich (isotypus)
Syzygospora physciacearum Diederich (isotypus)
Tremella candelariellae Diederich (isotypus)
Tremella cephalodiicola Diederich (isotypus)
Tremella cetrariicola Diederich Coppins (isotypus)
Tremella christiansenii Diederich (isotypus)
Tremella cladoniae Diederich & M. S. Christ. (isotypus)
Tremella coccocarpiae Diederich (isotypus)
Tremella coppinsii Diederich & Marson (isotypus)
Tremella dendrographae Diederich & Tehler (isotypus)
Tremella everniae Diederich (isotypus)
Tremella graphidastrae Diederich (isotypus)
Tremella haematommatis Diederich (isotypus)
Tremella harrisii Diederich (isotypus)
Tremella hypocenomycis Diederich (isotypus)
Tremella hypogymniae Diederich & M. S. Christ. (isotypus)
Tremella leptogii Diederich (isotypus)
Tremella lethariae Diederich (isotypus)
Tremella lichenicola Diederich (isotypus)
Tremella lobariacearum Diederich M. S. Christ. (isotypus)
Tremella macroceratis Diederich & Hafellner (isotypus)
Tremella microcarpa Diederich (isotypus)
Tremella monospora Diederich (isotypus)
Tremella montis-wilhelmii Diederich (isotypus)
Tremella nephromatis Diederich (isotypus)
Tremella papuana Diederich (isotypus)
Tremella parmeliarum Diederich (isotypus)
Tremella parmeliellae Diederich & Sérus. (isotypus)
Tremella pertusariae Diederich (isotypus)
Tremella phaeographidis Diederich, Coppins & Bandoni (isotypus)
Tremella phaeographinae Diederich & Aptroot (isotypus)
Tremella phaeophysciae Diederich M. S. Christ. (isotypus)
Tremella psoroglaenae Diederich (isotypus)
Tremella psoromicola Diederich (isotypus)
Tremella ramalinae Diederich (isotypus)
Tremella rinodinae Diederich & M. S. Christ. (isotypus)
Tremella santessonii Diederich (isotypus)
Tremella stevensiana Diederich (isotypus)
Tremella stictae Diederich (isotypus)
Tremella sulcariae Diederich (isotypus) 

Anamorphic basidiomycetes

Marchandiomyces lignicola Lawrey & Diederich (isotypus)