38 CLASSIFICATION AND TAXONOMY OF FUNGI 



31. Asci operculate 33 



33. Apothecia epigeic, variable in size, fleshy; stalk 



inconspicuous Order Pezizales 



33. Apothecia epigeic; large, fleshy; stalk promi- 

 nent Order Helvellales 

 33. Apothecia hypogeic, fleshy, remaining closed 



Order Tuberales 



Class Basidiomycetes 



34. Basidia septate longitudinally or transversely, or arising from a 

 teliospore or probasidium; or if non-septate, basidiocarp gelat- 

 inous; basidiospores commonly bud on germination 35 

 35. Basidiocarp lacking, basidia arising from teliospores 36 

 36. Teliospore (chlamydospore) on germination produces 

 tubes (basidia) septate or not, bearing sessile sporidia that 

 bud Order Ustilaginales 



36. Teliospore on germination produces tubular four-celled 

 basidium, each cell bearing a single sporidium on a ste- 

 rigma; sporidia produce germ tube on germination 



Order Uredinales 

 35. Basidiocarp present, mostly gelatinous 37 



37. Basidia septate 38 

 38. Septations transverse Order Auriculariales 

 38. Septations longitudinal, two- or four-divided 



Order Tremellales 

 37. Basidia non-septate, with two blunt terminal sterigmata 



Order Dacryomycetales 

 34. Basidia always non-septate, cylindrical or broadly clavate; pro- 

 basidium lacking; basidiospores usually form hyphae on germina- 

 tion Subclass Homobasidiomycetes 39 

 39. Hymenium exposed before maturity of spores 

 % Order Agaricales (Hymeniales) 

 39. Hymenium remaining closed or opening only after basidio- 

 spores have been liberated from basidia (Gastromycetes) 40 

 .js 40. Hymenium present and lining labyrinthiform chambers 



of gleba 41 



41. Gleba fleshy or wax\^ or sometimes slimy and fetid 

 at maturity, but if so not exposed 



Order Hymenogastrales 

 41. Gleba fleshy, borne on lower surface of centrally stipi- 

 tate pileus-like structure, angiocarpous or gymno- 

 carpous Order Podaxales 



41. Gleba fleshy or waxy or slimy and fetid and always 



exposed at maturity Order Phallales 



41. Gleba powdery and dry at maturity 



Order Lycoperdales 



