SYNOPSIS OF MYCKTOZOA 



193 



B. Spores minutely warted (sometimes minutely reticulated in 



T. fallax) :— 



a. Spirals of elaters two T. varia Pers. 



i. Spirals of elaters three or more — 

 a. Elaters shortly tapering at the ends. 



Sporangia sessile, wall uniformly thickened with granular 



matter ; elaters smooth or spinulose 



T. contorta Host. 



Sporangia sessile, wall without granular thickening ; spirals 

 or elaters faint . . T. lutescens List. (9, p. 216). 



Sporangia stalked, wall membranous, thickened in rounded 

 areas with granular deposits ; elaters spinose 



T. erecta Rex 



(3. Elaters smooth, very gradually tapering at the ends — 



Stalk hollow, filled with spore-like cells T. fallax Pers. 

 Stalk solid ......... T. Botrytis Pers. 



37. Oligonema Rostafinski. Sporangia minute, densely clustered 



or heaped, sessile ; threads more or less scanty, spiral bands 

 obscure ; spores reticulated. 



Sporangia globose, heaped together ; sporangium-wall smooth ; 

 spores irregularly reticulated .... O. nitens Rost. 



. Sporangia ovoid, crowded ; sporangium-wall with minute granu- 

 lar thickenings ; spores regularly reticulated 



O. flavidum Peck (18, p. 137). 



Threads more or less combined into a network, faintly reticulated 

 and marked with scattered rings, spines, and indefinite spiral 

 bands ; spores closely and regularly reticulated 



O. flavidum var. aureum List. (18. p. 138)t 



(syn. Calonema aureum Morg.) 



i 



38. Hemitrichia Rostafinski. Sporangia stalked or sessile ; capil- 



litium an elastic network of branching threads, thickened 

 with two to six spiral bands ; spores minutely warted or 

 reticulated. 



A. Spores nearly smooth, or minutely warted: — 



a. Capillitium red, spinose ..... H. rubiformis List. 



b. Capillitium yellow or yellow-brown — 

 a. Sporangia stalked — 



Stalk solid H. intorta List. 



Stalk hollow, filled with spore-like cells — 



Cup papillose H. clavata Rost. 



Cup smooth H. leiocarpa List. 



t The characters shown in the four specimens of Calonema aureum we have 

 seen do not in our opinion present specific distinction from forms of 0. flavidum, 

 of which species it would appear to be a variety. 



