102 USTILAGINACEAE 



z. In ovaries fUstilaginula 7:498 



(Ustilagopsis) 



II. Sori with a fungal involucre 



1. Spores in a powdery mass Sphacelotheca 7:499 



2. Spores in a hard black crust Melanopsichium 17:484 



Didymosporae 



Spores united by twos or 2-celled 



J. Spore-bearing hyphae tubular, enclosed in a stroma 



Mycosyrinx 17:484 

 II. Spore-bearing hyphae not in a stroma 



1. Spores joined laterally by a narrow isthmus; sporidioles pleurogenous 



Schizonella 7: 500 



2. Spores joined horizontally and broadly; sporidioles acrogenous 



Schroeteria 7: 500 



Dictyosporae 



Spores closely joined in masses, the latter appearing to be many-celled spores 



I. Spores or cells of each mass alike 



1. Sporidioles pieurogenous or acrogenous; usually not foliicole 



a. Promycelium simple Tolyposporium 7: 501 



b. Promycelium branched Tolyposporella 14:427 



2. Sporidioles acrogenous, typically foliicole 



a. Sporidioles numerous 



(1) Spore masses covered by a layer of sterile cells 



Doassansia 7: 502 

 (inch Cornuella, Burrillia 1 1 : 236) 



(2) Spore masses without a sterile layer 



Tuburcinia 7: 507 



b. Sporidioles solitary ; sori reddish, usually f ructicole 



Thecophora 7:507 



3. Sporidioles unknown ; sori mostly very black 



Sorosporium 7:511 



(inch Poecilosporium 16:380) 



II. Spores or cells of two kinds in each mass, central few large, peripheral many, 



small 



1. Sori of many sacks containing spore masses 



Polysaccopsis 16:381 



2. Sori without sacks Urocystis 7:515 



Class 5. BASIDIOMYCETES 



Spores produced on basidia, not inclosed in asci. 



Order 14. AGARICALES (HYMENOMYCETES) 

 Basidia exposed on an even or modified hymenium, the latter usually in the 

 form of gills, pores or teeth. 



