Hemitrichia 239 



the genus Trichia. The spores are not reticulate like those of 

 Trichia favoginea, as there are from three to five times as many 

 meshes on the hemisphere; they are like those of 0. flavidum. 

 C. aureum is not a definite species but a variant from 0. flavidum, 

 which may be produced occasionally wherever the latter species 

 is fruiting in abundance. The genus and species are retained 

 merely for convenience. 



Genus 41. HEMITRICHIA Rostafinski, Versuch 14. 1873. 



Sporangia stalked or sessile; capillitium a more or less elastic 

 network of branching threads, thickened with from two to six 

 continuous, spiral bands, as in the genus Trichia; bands winding 

 in a sinistral direction in all species except H. leiocarpa, where 

 they are dextral. 



Type species: Trichia clavata Pers. 



Spores nearly smooth or minutely warted. 



Capillitium red, spinose. 1. H. Vesparium 



Capillitium yellow, yellowish brown, or yellowish gray. 

 Sporangia stalked. 



Stalk solid. 2. H. intorta 



Stalk hollow, filled with spore-like cells. 



Stalk long or short; sporangia yellow; cup 

 papillose; capillitium with five or six sin- 

 istral bands. 3. H. clavata 

 Stalk long; sporangia gray; cup smooth; 



spiral bands dextral. 4. H. leiocarpa 



Stalk very short; sporangia sometimes sessile 

 or nearly so, yellow without granular de- 

 posits; capillitium with one to three sin- 

 istral bands. 5. H, abietina 

 Sporangia sessile or forming plasmodiocarps; wall 



thickened with dark, granular deposits. 6. H. Karstenii 



Spores reticulate. 7. H. Serpula 



1. Hemitrichia Vesparium (Batsch) Macbr. N. A. Slimc-Moulds 

 203. 1899. 



Lycoperdon Vesparium Batsch, Elench. Fung. Contin. 1: 253. 1786. 



Plasmodium purple-red (Lister). Total height 1.3 to 2.5 mm. 

 Sporangia clavate or sub-cylindrical, stalked or sessile, combined 

 in clusters or crowded, 1 to 1.3 mm. high, 0.5 to 0.7 mm. broad, 

 glossy or shining, dark red, red-brown, or olive-black; sporangial 

 wall of two layers, the outer continued into the stalk, the inner 



