Sturgis : New or Rare Myxomycetes t 327 



August, 1896. The latter consists of densely crowded sporangia 

 of a tawny color nearly approaching pale-raw-umber. The wall 

 is somewhat cartilaginous and the spores are rather larger than 

 in typical C. simplex, but the general characteristics are those oi 

 that species. Many of the sporangia show a peculiar large, 

 hollow columella, agreeing in this particular with the specimen 

 from Bartlett Mountain, N. H., referred to in Lister's Mono- 

 graph, Ed. 2, p. 108. If this latter specimen is correctly re- 

 ferred to D. simplex, that species would appear to be subject to 

 considerable variations in color and to be fairly widely dis- 

 tributed throughout the United States. 



Diachaea cylindrica Bilgr. This species, hitherto recorded 

 only from Philadelphia, occurs in a collection of Myxomycetes 

 made by Professor Thaxter at Intervale, N. H., in September, 

 1 901. In its densly crowded habit it resembles D. caespitosa; 

 the sporangia are also less markedly cylindric than in the type ; 

 but on the whole the specimen is evidently a form of D. cylindrica 

 in which the almost confluent character of the sporangia is cor- 

 related with a remarkably indefinite and ill-developed columella. 



Didymium fulvum sp. nov. PI. 14, f. 4-6. Sporangia gregar- 

 ious, sessile, elongate or forming curved plasmodiocarps, some- 

 times confluent, rarely subglobose, concave beneath, pale-raw- 

 umber in color, 0.5-0.8 mm. in diameter, occasionally seated on 

 a concolorous, membranous, lime-encrusted hypothallus which 

 may form pseudo-stalks ; sporangium-wall membranous, stained 

 with yellow blotches, thickly sprinkled with clusters of large, 

 acicular crystals of pale-yellowish lime. Columella very much 

 flattened or obsolete. Capillitium an abundant network of deli- 

 cate, almost straight or flexuose, pale-purple or nearly hyaline 

 threads, frequently with dark, calyciform thickenings as in 

 Mucilago, and occasionally showing fusiform, crystalline blisters. 

 Spores dark-purplish-brown, coarsely tuberculate, the tubercles 

 usually arranged in curved lines, paler and smoother on one side, 

 12.5 to 14.5 p in diameter. 



Habitat : On dead twigs, leaves and other refuse. Wet 

 Mountain Valley, Colorado, August, 191 3. 



This peculiar form has been found only once, but in consider- 

 able abundance. At first sight it bears a very close resemblance 

 to some form of Lepidoderma Carestianum, but notwithstanding 



