THE FUNGI WHICH CAUSE PLANT DISEASE 413 



Hydnacese (p. 402) 



Sporophore variable in texture, cu- 

 ticular, leathery, corky, felty, fleshy or 

 woody; free and stipitate, shelving 

 or resupinate; the hymenium warty, 

 thorny, spiny or with tooth-like 

 plates; basidia usually 4-spored, rarely 

 l-spored. 



Over five hundred species, mostly 

 very limited in their geographical 

 distribution, and chiefly epixylous, 

 although some are humus-loving. 



Fig. 297. — Typhula variabilis, 

 M, habit sketch; n, basidium 

 and spores. After Winter. 



Key to Genera of Hydnacese 



Sporophore annual 



Hymenium without a subiculum 1. Mucronella. 



Hymenium with a subiculum. 

 Hymenium with folds or wrinkles 



Crest of the folds entire 2. Phlebia. 



Crest of the folds incised 3. Lopharia. 



Hymenium with granules or warts 

 Granules penicillate, multifid 



Hymenophore fleshy 4. Kneiffiella. 



Hymenophore firm, not fleshy. ... 5. Odontia. 

 Granules simple 

 Hymenium porose, reticulate, 



granular 6. Asterodon. 



Hymenium with obtuse cylindric 



warts 7. Radulum. 



Hymenium with globose hollowed 



warts 8. Grandinia. 



Hymenium with more or less subulate 

 teeth or spines 



Pileus clavaria-like 9. Hericium. 



Pileus not clavaria-like 

 Teeth free, mostly fleshy 

 Teeth rounded. 



