LAMPRODERMA.] 
STEMONITACE^. 
125 
SPECIES EXCLUDED FROM THE GENUS. 
E. muscorum Lev. = Lcmiproderma irideum Mass. 
Genus 18,— LAMPRODERMA Rostafinski, Yersucli, p. 7 
(1873). Sporangia stalked, globose or ellipsoid ; sporangium-wall 
membranous, somewhat persistent, shining with iridescent colours ; 
stalk black ; columella cylindrical or clavate, reaching to half or 
more than half the height of the sporangium ; capiUitium con- 
sisting of branched anastomosing threads, radiating from the 
upper part of the columella. 
KEY TO THE SPECIES OF LAMPRODERMA. 
A. Total height 2 to 3 mm. 
CapiUitium purplish throughout, spores spinulose, 10 to 13 
1. L. physaroides 
CapiUitium black or grey, spores echinulate, 15 to 20 /x. 
2. L, echinulatum 
B. Total height 1 to 1-5 mm. 
a. Columella branching at the apex. 3. L. arcyrionema 
h. Columella obtuse or truncate. 
Threads of capillitium dark, pale at the base. 
4. L. i7'ideum 
Threads of capillitium dark or pale, not paler at the base. 
5. L. violaceum 
1. L. physaroides Rost., Mon., p. 202 (1875), and App., p. 25. 
Plasmodium"? Total height 2 to 3 mm. Sporangia glolDose or 
ellipsoid, stipitate, erect, rarely sessile, gregarious, 0*5 to 0*8 mm. 
diam., purplish -black with broken iridescent reflections, or shining 
like burnished brass ; sporangium-wall membranous, pei-sistent, 
purplish in the lower part, usually mottled with darker shades. 
Stalk cylindrical, usually 1-5 mm. high, 0-15 mm. thick, purplish- 
black, shining, longitudinally striate or rugose, rising from a dark 
purplish hypothallus. Columella cylindrical with a conical apex, 
or clavate, reaching to more than half the height of the spor- 
angium. Capillitium of purple-brown threads, rarely pale, 
radiating chiefly from the upper part of the columella, sparingly 
forked and anastomosing ; towards the surface bi-anching and 
forming a delicate, nearly colourless network. Spores purple- 
grey, closely spinulose, 11 to 14 /x diam. — Cooke, Myx. Brit., p. 49 ; 
Blytt, Bidr. K. Norg., Sop. iii. (1892), p. 7; Mass., Mon., p. 103. 
Stemonitis physa/roides Alb. & Schw., Consp. Fung., p. 103 (1805). 
Phyaarmn columbinum Pers., Obs. Myc, i., p. 5. Lamproderma 
cohcmbinum Rost., Versuch, p. 7 ; in Fuckel, Symb., Nachtr, p. 69 • 
Mon., p. 203 ; M ass., Mon., p. 100. Physo/i'um iridescens Berk, 
in Hook. Jonrn. (1851), p. 20, Lamproderma iridescens Rost., 
Mon., App., p. 25. 
