430 PROCEEDINGS: BOSTON SOCIETY NATURAL HISTORY. 
him the basis of a new genus. Peck again described it in 1879 as 
a new genus, Milleria, placing it with the puffballs and naming it 
after its discoverer, Miller, who found it along Wading River, Long 
Island. Although it has been looked for several times since it has 
never been found. Cornu, in 1883, described and figured the spore 
structure, and the same year Cooke called attention to the identity 
of the two species, having compared types of each. The germina¬ 
tion of the spores has never been reported. Literature : 36, 38, 39, 
99, 138. 
Tilletiaceae Schrot. 
Ivrypt. FI. Schles., 3 1 : 276. 1887. 
Sori either forming dusty erumpent spore masses or else perma¬ 
nently imbedded in the tissues. Germination by means of a short 
promycelium which usually gives rise to a terminal cluster of elon¬ 
gated sporidia that, with or without fusing in pairs, produce similar 
or dissimilar secondary sporidia or germinate directly inta infection 
threads. 
Key to Genera. 
i. Spores single. 
A. Sori dusty at maturity. 
1. Spores without conspicuous hyaline appendage Tilletia 
2. Spores with elongated hyaline appendage . Neovossia 
B. Sori permanently imbedded in the tissues . Entyloma 
ii. Spores in balls. 
A. Sori dusty. Spore balls with sterile cortex . Urocystis 
B. Sori rather permanently embedded in tissues. 
1. Spore balls without sterile cortex, 
a. Consisting entirely of dark colored spores 
Tuburcinia 
b. Consisting of light colored spores, 
With or without central sterile cells . Burrillia 
With central network of filaments . Tracy a 
2. Spore balls with sterile cortex . . Doassansia 
These genera rather^aturally fall into two groups, of which 
Tilletia, Neovossia, Tuburcinia, and Urocystis constitute one, hav- 
