372 PROCEEDINGS OF THE ACADEMY OF [1893. 



to P. citrlnellum Pk. most nearly. It differs from the various forms 

 of P. schumacheri Rost. in the absence of a columella. 



Badhamia orbiculata n. sp. 



Sporangia stipitate or sessile, orbicular, discoidal, irregularly 

 elongated or plasmodiocarpous ; averaging about one mm. when 

 simple but of larger size when plasmodiocarpous ; when stipitate 

 flattened or depressed above and plane or slightly umbilicate below ; 

 sporangium-wall single, more or less translucent from the varying 

 number of innate lime granules ; external surface sometimes covered 

 with scattered flat circular masses of lime granules, gray in color 

 except a small area about the attachment of the stipe which is dark 

 brown ; inner surface also gray except an area of brown becoming 

 brown-black in the center of the base; stipes short, 'Smm. high, deep 

 black, rough, ridged longitudinally ; capillitium composed of an 

 irregular central network of tubules containing white lime granules, 

 attached above and below by slender straight sometimes forked 

 tubules, to the sporangium-wall ; spores 1 4—1 6/x in diameter, dark 

 brown, warted under high amplification. 



Fairmount Park, Philadelphia, Pa. — Nebraska (H. Webber) Ohio 

 (A. P. Morgan.) 



The discoidal character of the simple sporangia of this species is 

 constant and there is but rarely, in any form, any noticeable degree 

 of convexity of the upper surface; on the contrary some sporangia 

 exhibit a somewhat double concave surface, the upper and lower 

 walls nearly coalescing in the center. 



