Chondrioderma.] BRITISH MYCETOZOA. 23 



sporangium separating from the inner. Columella large, hemi- 

 spherical, reddish-brown. Capillitium as in the last species. Spores 

 pale violet-brown, nearly smooth, 7 to 8 /a diam. 

 Hab. On dead leaves, etc. 



4. C. Michelii Rost. — Sporangia disc-shaped, on a stout, pale, 

 ochraceous, central stalk, rarely sessile, chalk-white. Columella 

 indefinite. Capillitium and spores as in C. tcstaccum. 



Hab. On dead leaves, etc. 



5. C. reticulatum Rost.— Differs from C. Michelii in the shape 

 of the sporangia only, which are flat plasmodiocarps, often branching 

 and forming a net. 



Hab. On dead leaves, etc. 



6. C. niveum Rost. — Sporangia subglobose, or plasmodiocarps, 

 white ; the outer layer of the sporangium-wall thick, the inner 

 membranous. Columella broad, convex, orange. Capillitium dark, 

 somewhat rigid, warted. Spores violet-brown, minutely spinulose, 



9 to 11 jx diam. 



Hab. On dead leaves, etc. 



Sub-genus 2. Leangium. — Sporangia mostly stalked ; sporan- 

 gium-wall often dehiscing in revolute lobes; of two inseparable 

 layers, the outer cartilaginous, charged with minute granules of 

 lime, the inner membranous. 



7. C. Trevelyani Rost. — Sporangia roundly ovoid, stalked or 

 sessile ; chestnut-brown. The sporangium-wall differs from that in 

 all other species of the sub-cohort Calcarinca; in being constructed of 

 an outer, cartilaginous brown layer, a thick middle layer consisting 

 of white crystalline calcareous deposits, and a delicate membranous 

 inner layer, to which the ends of the capillitium are attached. 

 Columella none. Capillitium a network of purple threads, with 

 dark thickenings at the nodes. Spores dark violet-brown, spinulose, 



10 to 12 /a diam. 



Hab. On dead leaves, etc. 



8. C. Sauteri Rost. — Sporangia subglobose, depressed, sessile, 

 pale pinkish-brown ; outer layer of sporangium-wall cartilaginous, 

 brittle, separating from the membranous inner layer. Columella 

 indistinct. Capillitium of sparingly branched, colourless or violet 

 threads, 2 to 3 ju. diam. Spores dark violet-brown, spinulose, 10 to 

 13 fj. diam. 



Hab. On dead wood, moss, etc. Rare. 



9. C. radiatum Rost. Sporangia subglobose, umbilicate beneath, 

 usually with a short, stout stalk, pale grey or brownish ; sporan- 

 gium-wall cartilaginous, obscurely granular, with an inseparable 

 membranous inner layer. Columella hemispherical. Capillitium 

 violet-brown, rigid, sparingly branched ; spores dark violet-brown, 

 minutely spinulose, 9 to 12 /x diam. 



Hab. On bark, twigs, etc. 



