282 PROCEEDINGS OF THE AMERICAN ACADEMY. 



One or more of these cells, as a rule the first or second or both of them, 

 increase in size beyond the rest, becoming densely filled with granular 

 material and oil globules, while the other cells grow out laterally 

 (Figure 16, Plate 8) and eventuall}' enclose the enlarged cells in a 

 manner similar to that of P. coproyhila and P. ixirasitica. It some- 

 times happens that when the end cell enlarges, protuberances are pro- 

 duced from the lateral sides, which may e\"en become subpendent, as in 

 P. parasitica (Figure 26, Plate 8). The de^■elopment of the cortical 

 cells is shown in Figures 16, 21, 22 and 27, while Figure 25 is a median 

 section and Figure IS a surface view of the mature bulbil. Thus at 

 maturity the bulbil is more or less spherical, 30-40 ^i in diameter 

 with 1-5 (usually 2 or 3) large central cells each of which varies from 

 10-14 /x in diameter (Figures 16, 25, Plate 8), surrounded by a cortex 

 consisting of a single layer of empty cells, rarely more, which is often 

 incomplete. The walls of the cells of this cortical layer usually retain 

 their color. 



Occasionally the short lateral branch instead of making but one or 

 one and a half turns continues the spiral until from three to five turns 

 are formed (Figures 17, 20, Plate 8). From the cells of the spiral are 

 profluced others laterally by budding, which eventually adhere to 

 each other laterally, thus forming a wall about the spiral. This is 

 similar to the process observed in connection with P. coprophila. 



This species also produces conidia on bottle-shaped sterigmata 

 similar to those described in P. coprophila, but they do not, as far as 

 the writer has observed, occur in white tufts scattered over the sub- 

 stratum as they tlo in the last named species. 



Papulospora sporotrichoides n. sp. 

 Plate 12, Figures 1-41. 



M^'celium white, procumbent, usuallj' scanty; bulbils dark choco- 

 late colored, somewhat spherical or flattened, 21-36 /x in diameter, 

 primordium a spiral of one to two turns, with conspicuous oil glol)ules, 

 the spiral sometimes not well marked. Conidia and conidiophores 

 of the Sporotrichum type. 



On Live Oak chips {Quercus agrifolia) and corn cobs from Clare- 

 mont, California, and Maple chips from Newton, Massachusetts. 



21ic bulbils-. — • In the de\'elopment of the bulbil a short lateral or 

 terminal branch coils up, divides into a number of short cells with 

 walls well distinguished, forming a close spiral of two or, rarely, three 

 turns. This process is illustrated by Figures 1-9, Plate 12. During 



