CLINTON: NORTH AMERICAN USTILAGINEAE. 
475 
ness, who called it Doassansia Alismatis. Setchell evidently made 
an examination of this material, as he states that it is not this species 
but an Entyloma with a compact spore ball. The writer’s descrip¬ 
tion is based on a specimen in the herbarium of the IT. S. department 
of agriculture, Division of vegetable pathology and physiology, 
collected by Simson in Florida in 1892. Sections from this material 
show that the spore balls have no definite cortex and that the spores 
are larger and thicker walled than either Doassansia Alismatis or 
Doassansia Sagittariae , to which the species has superficial resem¬ 
blance. The spore balls are also much larger; these in some cases, 
however, appear to be due to a very complete fusion of smaller 
spore balls. The peculiarity of the species is that the spore balls 
are not composed entirely of spores but of sterile cells and spores 
intermixed. The sterile cells are not strikingly different from the 
spores but still have more the appearance of the ordinary cortical 
cells. Upon staining with eosin the spores become more evident 
through their thicker more regular walls. Their germination is not 
known. Literature: 29. 
Burrillia pustulata Setch. 
Burrillia pustulata Setch., Proc. Amer. Acad. Arts Sci., 26 : 18. 1891. 
Doassansiopsis pustulata Diet., Nat. Pflanzenf., I 1 * * : 22. 1897. 
Exsiccati : Burrillia pustulata Setch., on Sagittaria variabilis , Seym. & 
Earle, Econ. Fungi Clinton Ust. Supp., C. 1. 
Sori in leaves, forming small hypophyllous blisters irregularly 
clustered or scattered over the surface and eventually rupturing, 
showing above as small more or less distinct yellowish or reddish 
brown areas ; spore balls situated in the spongy parenchyma, con¬ 
sisting of several irregular layers of fertile cells within which is a 
central mass of parenchymatous cells with oily contents, ellipsoidal, 
large, 200-350 p in length; spores rather firmly adhering sub- 
spherical or polyhedral, rarely more irregular, chiefly 8-12 p in 
diameter. 
Host: Sagittaria variabilis, Ill. (type), Wise. 
The blister-like pustules are characteristic of this species. The 
spore balls are formed just beneath the epidermis in the spongy 
parenchyma and so are easily loosened when by germination the 
epidermis is ruptured, and may drop out leaving behind very small 
