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By H. L. Barnett & B. B. Hunter

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Riaceae and Stilbaceae, as well as some genera in which there is inadequate knowledge of conidial formation, are excluded from this key. Conidia (arthrospores) formed by segmentation of vegetative hyphae or branches of nonmeristcmatic conidiophores; mature conidia usually with truncate ends, ellipsoid or cylindrical . . (Examples: Geotrichum, Amblyosporium)... Series ARTHROSPORAE Arthrosporae, Geotrichum lb Conidia (arthrospores) developing in basipetal succession by meristemic growth of the special portion of conidiophore, resulting in a gradual change from conidiophore to conidium; conidia usually, but not necessarily, hanging together in chains .

Examples: Humicola, Sepedonium, Microsporum) Series ALEURIOSPORAE 10 Aleuriosporae, Nigrospora Conidia (anncllospores) produced successively on apex of conidiogenous cells or conidiophore which increases slightly in length by pereurrent proliferation through previous conidial scars; successive scars appear as faint anncllations at apex of conidiogenous c e l l . . (Examples; Spilocaea, Scopulariopsis) ... Series ANNELEOSPORAE 52 Annellosporae, Spilocaea Conidia (blastospores) developing as buds from simple or branched conidiophores, or directly from vegetative cells or previous conidia, often forming simple or branched acropetalous chains ...

Series PHIALOSPORAE. Phialosporae, 151 Chahra ARTHROSPORAE 2a Conidiophores poorly developed or none 3 2b Conidiophores distinct and well developed 4 3a Conidia truncate at both ends, formed by segmentation of mycelium 3b Conidia rounded with truncate base, formed by segmentation of mycelium Geotrichum 68 Chrysosporium 68 4a Conidiophores simple 5 4b Conidiophores branched 6 5a Conidia globose 5b Comdia cylindrical with truncate ends 6a Conidiophores stout, branched only near apex 6b Conidiophores slender with both apical and lateral branches Wallemia 92 Ampulliferina 106 Amblyosporium 68 Oidiodendron 68 MERISTEM ARTHROSPORAE 7a Parasitic on plants, powdery mildews 8 7b Saprophytic or weakly parasitic, not powdery mildews 9 8a Conidia in basipetal chains Oidium 68 Ovulariopsis 70 9a Conidia 1-celled, hyaline Basipetospora 70 9b Conidia 2-celled, hyaline Trichothecium 108 9c Conidia dictyosporous, dark Coniosporium 134 8b Older conidia falling off before new one is formed ALTERNATE KEY TO SERIES AND GFNERA 45 ALEURIOSPORAE 10a Conidia long, slender (scolecosporous), I- to several-celled Anguillospora 140 10b Conidia typically 1- to 2-celled, globose to oblong II 10c Conidia typically 3- to several-celled 24 1 la Conidia hyaline or subhyaline (with slight pigment) 12 lib Conidia with distinct dark pigment 17 12a Pathogenic to man; macroconidia tuberculate Histoplasma 82 12b Pathogenic to man; macroconidia smooth Blastomyces 80 12c Saprophytic or parasitic on plants or fungi 13 13a Conidia 1-celled, in small groups at apex of forked conidiophores Glomerularia 13b Conidia 1- or 2-celled, not in clusters at apex of conidiophores 86 14 14a Conidiogenous cells slender, radiating from swollen cell 14b Conidiogenous cells short, stout; conidia smooth Umbelopsis 86 Botryoderma 86 I4c Conidiogenous cells slender; conidia rough-walled or with attached smooth cells 15 15a Conidia with attached small smooth cells Stephanoma 82 15b Conidia 1-celled, without attached smooth cells Sepedonium 82 15c Conidia with large apical rough-walled cell and smaller smooth basal cell 16a Basal cell of conidia rounded 16b Basal cell wedge-shaped 16 Mycogone 82 Chlamydomyces 82 17a Conidiophores short, poorly developed, or missing 18 17b Conidiophores usually well developed 22 18a Conidia with broad truncate base and pointed apex 18b Conidia ovoid to obclavate with rounded apex Echinobotryum 84 Asteromyces 84 18c Conidia globose to broadly ellipsoid 19 19a Conidia 1-celled, subglobose, shiny black, situated on a flat hyaline vesicle ..

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