166 ILLINOIS ACADEMY OF SCIENCE 
—; on Bidens, sp. Jayuya, 6074, on Bidens reptans, Vega 
Baja, 476, Maricao, 4483; on Xanthium longirostre, Afiasco, 
8740, Guayama, 5406; on Melanthera canescens, Utuado, 
6039, 652, on Ocimum micranthum, Utuado, 8062. 
Erysiphe Hedwig 
Erysiphe cichoracearum D. C. (?) On Dahlia, Monte 
Alegrillo, 2358; on Solanum torvum, Rosario, 4816, Preston’s 
Ranch, 6696, Cabo Rojo, 2239; Maricao, 2367, Arecibo, 6800; 
Naguabo, 9388, Pefiuelas, 9161, 9145, Mayaguez, 7064, 7322, 
Hormigueros, 7363, Maricao, 8825, 9127; on Cosmos caudatus, 
Sta. Ana, 7614, Tanama Rio, 7868; on Eupatorium microste- 
mum, Maricao, 4812. 
Erysiphe polygoni D. C. (?) On Cassia sp., Utuado, 6051; 
cn Cassia occidentalis, Guayama, 5330. 5416, Rio Piedras, 
5771, Rosario 9497, Pefuelas, 9138, Arecibo-Lares Road, 
7304, 7314, Cabo Rojo 9083, Manati, 4312, 5312; on Cassta 
tora. Maricao 2368, 8902, Quebradillas, 5625, Aguada, 5084, 
Pefiuelas, 4897, Guayanilla, 5927, 5897, San German, 5802, 
Guayama, 5399, Adjuntas, 6021, Mayaguez, 3024, 3882, 9152; 
on Phaseolus sp., Mona Island, 6247, Mayaguez, 6749; on 
Ph. adanthus, Aguada, 5075, on Vigna repens, Mayaguez, 
1856; on Chamaecrista, Peftiuelas, 9159. On Arraciaxannthor- 
rhiza, Indiera Fria, 3468. 
Erysiphe galeopsidis (?) On Eupatorium, Ponce, 4265. 
PERISPORIACEAE 
Hyaloderma Speg. 
Hyaloderma piliferum Pat. on Meliola sp., determined by 
Patouillard. Santurce, 1368. This specimen in the Bronx 
collection shows a Meliola with a Calonectria upon it, but the 
portion which I had did not show the Hyaloderma. 
Dimeriella Speg. 
Dimeriella erigeronicola sp. nov. Fungus superficial, epi- 
phyllous, black. Colonies circular, 1-4 mm. in diameter. No 
effect visible on the leaf tissue. Mycelium copious, straw- 
colored, crooked, about 1.5 » in diameter, septate. Perithecia 
black, numerous, globose, 64-102 » in diameter, bearing num- 
erous, 15+, appendages, mostly basal, which are similar in 
structure to the mycelium but darker in color, 1%-2 » in diam- 
eter, somewhat crooked, septate. Ostiole minute but distinct. 
Asci cylindrical, 31-34x7 u, 8-spored, obtuse. Spore two- 
