164 A Monograph of the Jtfyxogastres, 



Spores with raised lands combined to form a network. 

 Arcyria chrysospora, Mass. (figs. 268, 269). 



Sporangia sessile on a broad base, generally closely aggre- 

 gated, bright ochraceous yellow ; mass of capillitium and spores 

 yellow ; threads 5 p thick, forming a loose net with many free 

 ends, which generally terminate in slightly expanded, smooth, 

 bent or straight conical apices, spirals four, rather close, not 

 prominent, connected by less prominent ridges running parallel to 

 the long axis of the thread ; spores globose, with raised flat lands 

 forming a polygonal network, 16 p. diameter. 



Hemiarcyria chrysospora, Lister, Grev., vol. v., p. 126; Mass., 

 Rev. Trich., p. 357, fig. 37. 



On larch twigs lying on the ground and on the surrounding 

 herbage. Lyme Regis. 



A fine species with the sporangia reaching to 1 mm. diameter, 

 approaching in habit and general structure the form sessilis of 

 Arcyria serpula, but quite distinct in the larger spores, the 

 thinner capillitium threads without spines, and having the 

 spirals connected by ridges parallel to the axis of the elaters. 

 From three to five polygons on a hemisphere of the spore. 



Arcyria serpula, Mass. (figs. 273, 274a). 



Either a vein-like, creeping plasmodiocarp, usually anasto- 

 mosing to form a net, or subglobose, scattered, and sessile on 

 a broad base, wall thin, fragile, yellow, sometimes tinged brown ; 

 mass of spores and capillitium yellow or orange ; threads of the 

 dense capillitium 5 6 /x thick, forming a net with numerous 

 free ends which usually terminate in a smooth, thin, tapering 

 spine 8 10 fi long, spirals thin, not prominent, rather distant, 

 furnished with numerous long, slender spinules; spores globose, 

 with narrow, raised flat bands forming an irregular network, 

 10 12 n diameter. 



a. plasmodiocarpa. Plasmodiocarp vein-like, usually forming 

 a network. 



