27'2 PROCEEDINGS OF THE AMERICAN ACADEMY. 



elevations are composed of closely compacted basidia-like structures. 

 Unfortunately thus far the writer has observed only a few scattered 

 basidia with basidiospores so that it has been impossible to obtain a 

 specific determination. 



BULBILS NOT YET CONNECTED WITH A PERFECT 



FORM AND INCLUDED IN THE FORM GENUS 



PAPULOSPORA. 



Key to (In Species of Papulospora 

 I. Primordium intercalary. 



A Bulbils black P- pannosa n. sp. 



B. Bulbils yellowish to dark brown. 



1. Bulbils, brownish-yellow, central cells 28-55 fi in diameter. 



P. immersan. sp. 



2. Bulbils straw-color, central colls 10-20 n in diameter. 



/'. irregularis n. sp. 

 :;. Bulbils dark brown, hyphae with clamp-connections. 



P. aiwmala n. sp. 



II. Primordium one or more lateral branches. 



\ Primordium normally a, single lateral branch. 



1. Primordium a spiral. 



:>. CVlls of bulbil heterogenous, definite cortex, 

 i ( tin' central cell. 



a. Cortex complete P. parasitica, 



p. " incomplete Acrospeim mirahilis. 



ii. More than one centra! cell. 



a. Spiral in one plane, cortical cells spinulose. 



P. spinulosa n. sp. 

 |3 Spiral in more than one plane, 2-6 central cells. 



(a) Bulbils a dark brown P. coprophila. 



ibi " brick red P. rubida n. sp. 



b. Cells of bulbil homogenous. 



i. Bulbils brown 21-36 m in diam. . . P. sporotrichoides n. sp. 

 ii. " steel gray 21-36 m in diam P. cinerea n. sp. 



2. Primordium not a spiral 



a. Bulbils large, 100-750 M in diam P. aspergiUiformis. 



b. " 30-35 m in diam. cream color P. Candida. 



B. Primordium two or more lateral branches forming a spherical aggre- 

 gation of cells at the top P. polyspora n. sp. 



Heretofore fungi producing bulbils have been referred chiefly to the 

 form-genera Papulospora and Helicosporangium, but the characters 

 on which these two have been based are not clearly defined, and as 

 already stated, it docs not seem desirable to recognize more than one 

 form-genus. Since Papulospora was the name first employed to 

 represent bodies of this nature, all the fungi that the writer has ex- 

 amined that produce bulbils, the perfect form of which has not been 

 determined, are placed in this form-genus which may be described 

 as follows. 



