THE ORDERS OF FUNGI 3S 



3. Spores of perfect or sexual stage borne in asci 



Class Ascomycetes 21 

 3. Spores of perfect or sexual stage borne on basidia 



Class Basidiomycetes 34 

 3. Lacking asci and basidia but usually possessing asexual spores 



Class Fungi Imperfecti 43 



THE ORDERS OF FUNGI 



Class Myxomycetes 



4. True plasmodiuni not formed, swarm spores amoeboid but not 

 flagellate ^ 



5. Swarm spores retaining individual identity, encyst at tip of 

 "^^ss Order Acrasiales 



5. Swarm spores connected by long pseudopodia into chains or 



^^^^ Order Labyrinthulales 



4. True plasmodium formed, swarm spores amoeboid and flagellate 



6. All parasitic on vascular plants " Order Plasmodiophorales 

 6. Saprophytic y 



7. Spores borne externally on thallus, each producing eight 

 swarm cells on germination 



Subclass Exosporeae (Alyxogastres, in part) 

 7. Spores borne within fructification, each producing one or 

 two swarm cells on germination 



Subclass Endosporeae (Alyxogastres, in part) 8 

 8. Spores in mass typically violaceous or black, lime pres- 

 ent or absent 9 

 9. Peridium, capillitium, or both calcareous 



Order Phvsarales 



9. Neither peridium nor capillitium calcareous, lime usu- 

 ally present on stipe and columella Order Stemonitales 



8. Spores in mass typically pallid, yellow, brown, or rosy, 

 lime never present 10 



10. True capillitium lacking or only scantily developed 



Order Liceales 

 10. Capillitium well developed, thread-like, sculptured 



Order Trichiales 

 Class Phycomycetes 



11. Mycelium lacking or poorly developed (a rhizomycelium), en- 

 tire thallus or its parts functional in reproduction 12 

 12. Thallus microscopic, unicellular, becoming a single sporan- 

 gium, a sorus of sporangia, or a gametangium; sexual repro- 

 duction unknown or of various kinds; zoospores uniciliate or 

 biciliate Subclass Archimycetes 13 



