178 THE JOURNAL OF BOTANY 



Sporangia very minute ; capillitium scanty, colourless, branching 

 from a short columella . • . . .19. Echinostelium. 



B. Sporangium- wall more or less persistent. 



Sporangium-wall a uniform membrane ; capillitium spreading 

 from the columella 20. Lamproderma. 



Sporangium-wall persistent in the form of minute discs at the 

 apices of the rigid forking capillitium threads 



21. Clastoderma. 



Order II. — AMAUROCHiETACEa:. Sporangia combined into an 

 sethalium. 



Capillitium irregularly branched . . .22. Amauroehaete. 



Capillitium with chambered vesicles .... 23. Brefeldia. 



Cohort II. — Lamprosporales. Spores variously coloured, but not 

 violet-brown or purplish grey (violet in some species of 



Cribraria). 



Subcohort I. — Anemine^s. Capillitium wanting, or if present 

 not forming a system of uniform threads (except in 



Alwisia, q.v.). 



Order L — HETERODERMACEiE. Sporangium- wall membranous, 

 beset with microscopic round plasmodic granules. 



Sporangia aethalioid, the walls not forming a persistent net 



24. Lindbladia. 



Sporangium-wall forming a persistent net . . 25. Cribraria. 



Sporangium- wall persistent in the form of numerous parallel ribs 



26. Dictydium. 



Order II. — Liceace^:. Sporangia solitary; sporangium- 

 wall cartilaginous (membranous in Licea biforis). 



Sporangia solitary, sessile 27. Licea. 



Sporangia stalked, furnished with a lid of thinner substance 



28. Orcadella. 



Order III. — Tubulinace^e. Sporangium-wall membranous, 

 without microscopic plasmodic granules ; sporangia 

 clustered, cylindrical or ellipsoid. 



Sporangia cylindrical, compacted, without pseudo-columella 



29. Tubulina. 



Sporangium-wall with tubular extensions connecting it with a 



hollow pseudo-columella . 



.m 



Sporangia stalked, ellipsoid, with a brush of tubular threads 

 attached above and below to the sporangium -wall 



31. Alwisia. 



Order IV. — Reticxjlariaceje. Sporangia combiued into an 

 ©thalium ; their walls incomplete, perforated or forming 

 a spurious capillitium. 



Sporangia columnar 32. Dictydisethalram. 



