154 



USTILAGINALES 



b. Teliospores seriate; telia lentiform to 

 columnar 



(1) Teliospores in x-laycred subepidermal 



crusts; I — ; Asia Phacopsora 14:289, D 42 



(2) Teliospores in exserted columns, often 



corneous 



(a) Uredia with a peridium; chiefly N. Hem. Cronartium 7:597, D 42; 39 



(b) Uredia with pseudoparaphyses; I — ; 



Malaysia Crossopsora 23:854, D 43 



B. Aecia without peridium 



1. Teliospores hyaline or nearly so; II — ; India, 



Afr. Chnoopsora 21:600, D 47 



2. Teliospores more or less intensely brown; N. 



Hem. Melampsora 7:586, D 47; 39 



Phragmosporae 



Teliospores typically x-celled, rarely 2- or 1-celled, hyaline or colored 



A. Telia on ferns 



1. Teliospores scattered irregularly in the meso- 



phyll, rarely in a subepidermal crust 



2. Teliospores not in the mesophyll, but in the 



epidermis 



a. Uredospores of two kinds, with pores; I — ; 



N. Hem. 



b. Uredospores of one kind, without pores 



B. Telia not on ferns 



1. Teliospores in the epidermal cells; II — ; Vac- 



cinium, N. Hem. 



2. Teliospores beneath the epidermis; chiefly N. 



Hem. 



Uredinopsis 17:269, D 36 



Hyalopsora 17:268, D 37 

 Milesia 7:768, D 38 



Calyptospora 7:766, D 39; 40 

 Pucciniastrum 7:762, D 40 



Order 16. USTILAGINALES 



Parasites chiefly in the interior of plant tissues and especially in fruits and 

 flowers, mycelium usually inconspicuous until fruiting occurs; asci represented by 

 erect parallel fertile hyphae in a few genera, but for the most part no longer recog- 

 nizable in the hyphal knots in which the spores are produced; sporogenous hyphae 

 disappearing at maturity to leave a dense mass of spores, often in a gall-like deforma- 

 tion of the host-organ; conidia often present; spores germinating to produce a 

 promycelium bearing sporidioles, or sometimes developing into a mycelial thread, 

 simple, variously colored or ornamented. 



Key to Families 



A. Promycelium septate transversely, bearing spo- 



ridioles at the septa and apex 

 B. Promycelium simple, bearing a crown of whorled 

 conidia 



Ustilaginaceae p. 154 

 Tilletiaceae p. 155 



Family 65. USTILAGINACEAE 



Dietel 6; 7:449 



Spores typically arising from the complete division of the mycelium to form 

 powdery masses, single or united in balls, but rarely agglutinate; promycelium 



