22 



BRITISH MYCETOZOA. 



[Craterium. 



on the upper half and lid. Capillitium with large white or yellowish 

 lime-knots. Spores violet-brown, spinulose, 7 to 9 p diam. 



Hab. On dead leaves. 



3. C. mutabile Fr.— Sporangia ovoid, stalked, without a distinct 

 lid, rough, yellow, the wall thin, with innate clusters of yellow lime 

 granules. Capillitium with pale yellow lime-knots. Spores violet- 

 brown, spinulose, 8 to 9 ju. diam. 



Hab. On dead leaves. 



Genus 7. LEOCAEPUS Link.— Spo- 

 rangium-wall uniform, of two layers; the 

 outer cartilaginous and calcareous, shining; 

 the inner hyaline. Capillitium of two 

 systems, one a network of hyaline threads, 

 the other of coarse anastomosing branches 

 charged with brownish lime-granules. 



1. L. verrucosus Link. — Sporangia 

 ellipsoid, crowded, chestnut-brown, shining 

 as if varnished, with short membranous 

 stalks. Capillitium as in the genus. 

 Spores violet-brown, 11 to 13 /u diam. 



Hab. On dead leaves, etc. 



Leocarpus vermcosus Link. 



a. Cluster of sporangia. Mag- 



nified 2^ times. 



b. Hyaline "threads and branch- 



ing lime-knot of the capil- 

 litium, with two spores. 

 Magnified 120 times. 



Gexus 8. CHONDRIODERMA Rosta- 

 finski. — Sporangium-wall of two layers, 

 containing granular deposits of lime. 

 Capillitium without lime-knots. 



Sub - genus 1. Euchondriodcrma. — 

 Sporangia mostly sessile, the outer wall a 

 smooth crust composed of globular lime- 

 granules, the inner membranous. 



1. C. spuniarioid.es Rost. — Sporangia 

 subglobose, sessile, crowded on a profuse 

 hypothallus, white ; the two layers of the 

 wall usually adhering. Columella convex, 

 pale. Capillitium of slender flexuose 

 purplish threads. Spores violet-brown, 

 minutely spinulose, 8 to 11 /» diam. 



Hab. On dead leaves, etc. 



2. C. globosum Rost. — Differs from 

 C. spumarioides in the outer layer of the 



sporangium-wall separating more freely from the inner, and in the 

 larger, darker, more spinulose spores, 10 to 14 p diam. 

 Hab. On dead leaves, etc. 



3. C. testaceum Rost. — Sporangia subglobose, sessile on a broad 

 base, dull or pale flesh-coloured ; the eggshell-like outer wall of the 



Fig. 16. 



CHONDRIODERMA TESTACEUM 



Rost. 



a. Group of three sporangia ; 



in the upper one the double 

 wall is broken away in part 

 and the columella exposed. 

 Magnified 9 times. 



b. Portion of the outer and 



inner layers of the sporan- 

 gium-wall j to the latter 

 the capillitium threads are 

 attached : three spores. 

 Magnified 170 times. 



