LAMPRODERMA 195 



branous, persistent; stalk subulate or cylindrical, black, rising from a 

 well-developed hypothallus; columella cylindrical, obtuse, about half 

 the height of the sporangium; capillitium ranging from black to color- 

 less, arising chiefly from the upper part of the columella; threads 

 stout, sparingly forked, colorless and slender at the tips; spores dark, 

 strongly echinulate, 15-20 /x. 



Reported from Europe and Australasia. 



5. Lamproderma insessum G. List. 



Trans. Brit. Myc. Soc. 4 : 41. 1912. 



Sporangia sessile, clustered, iridescent purple, subglobose or form- 

 ing short plasmodiocarps, 0.8 mm. in diameter; wall membranous, 

 pale purple; columella lacking; capillitium a scanty, loose network of 

 broad purplish threads, often expanded at the angles and marked 

 with a few bead-like thickenings; spores dark brownish purple, closely 

 spinulose, 18-19 ju. 



Meylan has found in Switzerland a similar form, but with smaller 

 spores, which he thinks is an abnormal development of L. columbinum. 

 Otherwise known only from a single collection. If verified, L. insessum 

 might well be transferred to Diacheopsis. 



Scotland. 



6. Lamproderma echinosporum Meylan 



Bull. Soc. Vaud. Sc. Nat. 55 : 241. 1924. 



Sporangia globose or ovoid, attaining 1 mm. in diameter, sessile or 

 rarely stalked, dark grayish brown, dull; peridium persistent, mem- 

 branous, somewhat furrowed; columella reaching half to three-quarters 

 the height of the sporangium; capillitium dark violaceous brown; 

 spores purple-black, covered with pointed or obtuse spines 1 /z long, 

 14-16 /j, in diameter. 



The large, dark, spiny spores suggest those of L. echinulatum, from 

 which the present species is separated by its dull colors and sessile 

 habit. Meylan regards it as nearly related to L. atrosporum, from 

 which it differs in its brown persistent peridium, the suggestion of 

 violet in the capillitium, and its larger, strongly spiny, but not 

 reticulate spores. 



Switzerland. 



7. Lamproderma gulielm^e Meylan 



Bull. Soc. Vaud. Sc. Nat. 52 : 449. 1919. 

 PI. XIII, Figs. 314, 315. 



Sporangia stipitate, spherical, 0.5 mm. in diameter or less, silvery 

 blue with black depressed spots; stalk slender, subulate, black, 1- 



