TILLETIACEAE 



155 



septate transversely, the sporidioles arising at the se 

 often increasing further by proliferation; mycelium 

 the promycelium. 



A. Spores single, not united in balls 



1. Sori traversed by many sterile bundles of 



hyphae 



2. Sori without sterile hyphal bands 



a. Spores powdery 



(1) Sori with a more or less permanent 



peridium 



(2) Sori without a peridium 



b. Spores agglutinate into a carbonous mass 



(1) Sori produced in chambers within the 



host-plant; Polygonum 



(2) Sori on the surface of the host-plant, at 



first with a thin peridium 



B. Spores united by pairs or in balls 



1. Spores united by pairs 



a. Sori with a double peridium; Cissus, Tropics 



b. Sori without peridium; Carex, Elyna, Eur., 



Am. 



2. Spores united in larger numbers in balls 



a. Spores loosely united, readily separable by 



pressure 



b. Spores firmly united 



(1) Spore-balls fertile throughout 



(a) Promycelium simple or dichotomous 



with a single apical sporidiole 



(b) Promycelium simple, sporidioles lateral 



and terminal; chiefly Poaceae 



(c) Promycelium ramose, sporidioles lat- 



eral; Andropogon, N. A. 



(2) Spore-balls with fertile surface, sterile in- 



terior; Cyperaceae, Am. 



pta and usually the apex also, 

 rarely produced directly from 



Farysia 23:631, D 13 



Sphacelotheca 7:499, D 11; 40 

 Ustilago 7:741, D 7; 40 



Melanopsichium 17:484, D 11 

 Cintractia 7:480, D 12 



Mycosyrinx 17:484, D 14 

 Schizonella 7 :500, D 14 



Sorosporium 7:511, D 14; 40 



Thecaphora 7:507, D 14 

 Tolyposporium 7:501, D 15; 40 

 Tolyposporella 14:427, D 15 

 Testicularia 7:150, D 15 



Family 66. TILLETIACEAE 

 Dietel 16; 7:481 



Spores massed in superficial or erumpent sori or permanently included in the 

 tissues of the host-plant, single or united in balls and then often associated with 

 sterile empty spores; promycelium simple, with apical whorls of sporidioles; spores 

 colored or hyaline. 



A. Spores single 



1. Spores with simple membrane 



a. Sporidioles not more than 12 in each whorl 



(1) Sori powdery, largely in fruits; chiefly 



Poaceae 



(2) Sori not powdery, in leaves and stems 



(a) Spores bright-colored to brownish 



(b) Spores dark brown 



(3) Sori in galls on roots; mostly Juncaceae 



and Cyperaceae 



Tilletia 7:481, D 16; 40 



Entyloma 7:487, D 17; 40 

 Melanotaenium 7:496, D 18 



Entorhiza 7:497, D 19 



