22 GUIDE TO CRYPTOGAMS. 



2 a. Reproduction by basidiospores borne on or in a mostly 

 highly developed sporocarp. 

 3 a. Sporocarp closed at least until the ripening of the 

 spores, bearing the hymenium in one or more cavi- 

 ties in the interior. 



GASTEROMYCETES. (Puff-balls and their allies.) (See 

 page 24.) 



3 b. Sporocarp with an exposed hymenium, on the surface 



of which the spores are developed. 



HYMENOMYCETES. (Toad-stools and their allies.) 

 Sporocarp not gelatinous. (See page 25.) 



TREMELLINE^E. Sporocarp gelatinous. (See page 28.) 

 2 b. Reproduction by ascospores. Sporocarp often highly 

 developed. 



DISCOMYCETES. (Cup-fungi and their allies.) Sporo- 

 carp of various forms, such as club-shaped, cup-shaped, saucer- 

 shaped, etc., either closed at first and soon becoming wide open, 

 bearing the trymenium on its exposed inner side, or the hyme- 

 nium covering from the first the exposed surface of the sporocarp, 

 or at least the upper part of it ; mostly fleshy. (See page 28.) 



PYRENOMYCETES. Sporocarp spheroidal, pyriform, 

 flask-shaped or elongated, opening only b} 7 an ostiole or a two- 

 lipped mouth, mostly carbonaceous. (Genera not given.) 



PERISPORIACE^E. Sporocarp mostly spheroidal, not 

 opening by an ostiole but dehiscing irregularly, membranaceous, 

 coriaceous or carbonaceous, usually sessile on a well-developed, 

 persistent mycelium which is always superficial. (Genera not 

 given.) 



2 c. Reproduction never by basidiospores or by ascospores. 



4 a. Mycelimn with partitions. Reproduction never 



oosporic. 



UREDINE^E. (Rusts and their allies.) Mycelium parasitic 

 in the tissues of the higher plants. Spores formed 03^ constric- 

 tion at the ends of special hyphae, appearing mostly in clusters 

 forming small spots on the leaves and stems ; sometimes para- 



