STEMONITIS.] STEMONITACE/E. 109 
Sporanc^ium-wall somewhat persistent, columella about half the 
height of the sporangium. (18) Lamproderma. 
mm 
Fig. 26. — Lamproderma irideum Mass. 
a. Group of sporangia. Magnified 2^ times. 
J. Sporangium deprived of spores, showing capil- 
litium. Magnified 25 times. 
Fig. 26. 
Sporangium-wall partly evanescent, persistent in the form of 
minute discs at the apex of the rigid capillitium threads. 
Columella short or hardly evident. (19) Clastoderma. 
Fig. 27.— Clastoderma Debaryanum Blytt. 
a. Group of sporangia. Magnified 10 times. 
h. Sporangia deprived of spores, showing capillitium. 
Magnified 64 times. 
Fig.. 27. 
Genus 15.— STEMONITIS Gleditsch, Meth. Fung., p. 140, tab. 
iv. (1753). Sporangia cylmdrical, stipitate, fasciculate; the stalk 
extending within the sporangium to near the apex as a columella ; 
capillitium formed of numerous threads radiating from all parts 
of the cokimella and combined into a loose net- work, the ultimate 
branches united into a superficial net attached to the evanescent 
sporangium-wall. 
KEY TO THE SPECIES OF STEMONITIS. 
A. Spores grey, violet-grey, or rufous- violet : — 
a. Spores spinulose, more or less reticulated, surface net of 
capillitium with angular meshes. 1, S. fusca 
b. Spores minutely warted, almost smooth, surface net of 
capillitium with usually rounded meshes — 
Meshes of surface net of capillitium 20 to 100 or 
more wide ; sporangia forming on wood. 
2. S. splendens 
Meshes of surface net of capillitium less than 20 /x 
wide ; sporangia forming on herbaceous plants. 
3. S. herhatica 
