[Plate XVIII.], Figs. 6, 6 a, 6 b.
Sporangia distinct, coalescent or plasmodiocarpous, large, when isolated 1–1.5 mm., dull drab in color, very sparsely sprinkled with white tetrahedral or irregular scales; the peridium thin, more or less translucent, rugulose, dull brown, persistent; columella none; capillitium abundant, under the lens purple-brown, sparingly branched, even, stout, rigid, no calcareous deposits nor vesicles; spores 8–10 µ, minutely warted, fuliginous.
Yosemite Cañon, California, Prof. B. Shimek.
This is, no doubt, similar to L. carestianum but differs in the size and habit of the sporangia, and in the fact that the capillitium is uniform throughout, whatever the style of fructification, and in the size, color, and surface characters of the spore.
Evidently not Didymium granuliferum Phill. Both will, no doubt, be again collected, and we shall then have much needed light.
Nor is this quite Rostafinski's species as cited. The spores are much smaller; Rostafinski says 10–12 or more, and calls for a distinctly netted capillitium, the surface strongly marked by abundant calcareous crystals. Ours may be a different thing.
5. Colloderma G. Lister
- 1910. Colloderma, Jour. of Botany, XLVIII., p. 312.
Peridium double; the outer gelatinous, the inner membranaceous; capillitium intricate, limeless.
Colloderma oculatum (Lipp.) G. Lister.