156 



USTILAGINALES 



b. Sporidioles very many in a terminal head; 

 Poaceae, N. Hem. 

 2. Spores with double membrane, inner layer hya- 

 line, outer dark-brown; Rhynchospora, Brazil 

 B. Spores united in groups of several to many 



1. Spore-balls with very inconspicuous sterile 



spores on the surface 



2. Spore-balls with distinct sterile spores on the 



surface or inside 



a. Fertile spores few in each ball 



(1) Sori with a peridium; Solanum, S. A. 



(2) Sori without peridium 



b. Fertile spores many in each ball; on hydro- 



phytes 



(1) Spore-balls with a single outer layer of 



fertile spores 



(a) Interior of ball filled with a network of 



hyphae; Hydrocharis, Spirodela, N. 

 Hem. 



(b) Interior of ball filled with sterile paren- 



chymic cells; Potamogeton, Sagittaria 



(2) Spore-balls with fertile spores in the in- 



terior 



(a) Spore-balls with a surface layer of 



sterile spores 



(b) Spore-balls without sterile surface layer; 



N. A. 



Neovossia 16:375, D 19 

 Perichlamys 14:430, D 19 



Tuburcinia 7:507, D 19 



Polysaccopsis 16:381, D 22; 40 

 Urocystis 7:515, D 20 



Tracya 11:236, D 22 

 Doassansiopsis 23:630, D 23 



Doassansia 7:502, D 24; 40 

 Burrillia 11:236, D 24 



Addendum. GRAPHIOLACEAE 



Sori erumpent, single or several enclosed in a compact black peridium; 

 sporogenous hyphae arising from the base, erect, dense, typically producing lateral 

 whorls of four initials which divide transversely to form spores; parasites on leaves 



of palms. 



This family is of very uncertain relationship and has often been included in the 



Deuteromycetes. 



A. Sori single, typically with inner peridium; spo- 



rogenous hyphae, separated by hyphal bundles, 

 falling apart after the production of spore-ini- 

 tials; spores globose or oblong 



B. Sori several in a stroma, inner peridium lacking; 



sporogenous hyphae not separated by hyphal 



bundles, and not falling apart but shrunken 



and persistent; spores mostly triangular, plate- Stylina 



like 



Graphiola 7:522 



