84 BOTANICAL GAZETTE [aucusr 
of mycelium and an abundance of acervuli when transferred to ster- 
ilized oak and grape stems. The development of the so-called 
secondary spores has not been observed in cultures of this species. 
Gleosporium feetidophilum, n. sp.° (fig. 72); on skunk cab- 
bage (Spathyema fetida). 
The Glceosporium which was found to infest this host causes 
black depressed, elliptical spots on the spathes. Ina micro- 
scopic section, the cell walls are found to be very much collapsed; 
with the exception of those cells just above the acervuli, which 
frequently retain their normal shape and color though elevated 
by the underlying mycelium, and causing pale elevated spots on 
the surrounding blackened portion. The acervuli remain covered 
for some time, and the customary basal stroma is lacking ; the 
mycelium forms an irregular, loosely interwoven mass at the 
fruiting points, the conidia being borne some distance beneath 
the surface, frequently filling the large intercellular spaces. 
They are slender, elliptical, and slightly inequilateral, varying 
in size from 7—12-1 5X 2-3p. 
Conidia sown in a hanging-drop of water become closely 
granular or vacuolate, usually once septate and frequently 
swollen at the ends, previous to germination. They send out two 
or three germ tubes which produce conidia quite close to the 
mother conidium. In potato-agar the growth is much more 
vigorous, as many as five germ tubes having been observed 
originate from a single conidium. These branch frequently se 
a monopodial fashion and the conidia are abjointed so abundantly 
as to give the colony a yeast-like appearance. The colony is 
characterized by the pronounced stellate radiations which remain 
quite distinct from each other in the earlier growth, but the out 
spreading mycelium becomes more or less intermingled, renders | 
ing the radiations less pronounced, About 2™™ from the centeh, 
these radiations branch profusely, giving to the colony 4 more 
or less uniform margin. The colony which is at first quite white 
assumes with age a pale yellow tinge. 
8 
Collected by Professor G. F. Atkinson, Ithaca Flats, April 10, 1896. 
