194 THE JOURNAL OF BOTANY 



P 



Spirals of capillitium one to three, prominent, sporangium- 

 wall membranous . . . ♦ . H. Wigandii List. 



Spirals of capillitium three or more, indistinct; spor- 

 angium-wall thickened with granular deposits 



H. Karstenii List. 



B. Spores reticulated : 



Capillitium threads spinose .... H. Serpula Rost. 



Capillitium threads smooth . . . H. chrysospora List. 



39. Cornuvia Rostafinski. Sporangia sessile ; capillitium a net- 

 work of threads with thickenings in the form of simple rings ; 

 spores reticulated • . • C. Serpula Rost. 



Order II. — Arcyriace^e. 



40. Arcyria Hill. Sporangia stalked ; sporangium-wall evanescent 



above, persistent below as a membranous cup ; stalk filled 

 with spore-like cells; capillitium with thickenings in the 

 form of half-rings, cogs, spines, or broken reticulation, rarely 

 with three to five faint spiral lines in addition. 



A. Spores 9-11 /* diam. ; sporangia orange-red or buff : — 



Sporangia ovoid ; wall reticulated . A. ferruginea Sant. 

 Sporangia clavate ; wall papillose • A. versicolor Phill. 



B. Spores 6-8 /* diam. : — 



a. Capillitium attached to the cup — 



Sporangia clavate, grey or yellowish ; capillitium closely spin- 

 ulose or war ted ........ A. albida Pers. 



Sporangia globose, yellow ; capillitium with spines arranged 

 in an open spiral A. pomiformisRost.t 



Sporangia globose, white, on slender stalks ; capillitium closely 

 spinulose or warted, the warts usually arranged in more or 

 less spiral lines A. globosa Schwein. 



Sporangia red, ovoid or subcylindrical ; capillitium marked 

 with cogs and half-rings A. punicea Pers. 



Sporangia rose-coloured, subcylindrical or turbinate, small; 

 capillitium delicate, marked with transverse bands and 



b. Capillitium free from the cup 



g 



a. 



Network of mature capillitium expanding, not drooping — - 

 Capillitium marked with cogs and spines only 



A. incarnata Pers. 



Capillitium marked with cogs, spines, and three to four 

 indistinct spiral bands in addition . A stipata List. 



._ 



f There appears to be sufficient ground for separating Arcyria pomiformis 

 and A. globosa from A. albida, and placing them as distinct species. 



