Part 36 (1/2)

3. LEPIDODERMA CHAILLETII _Rost._

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 spa.r.s.ely 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 , minutely warted, fuliginous.

Yosemite Canon, California, _Prof. B. s.h.i.+mek._

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._

1894. _Didymium oculatum_ Lipp., _Verh. Zo-Bot. Ges. Wien_, XLIV., p. 74.

1910. _Colloderma oculatum_ (Lipp.) G. List., _Jour. Bot._, XLVIII., p. 312.

Sporangia gregarious, globose, or sub-globose, sessile or short-stipitate, olivaceous or purplish-brown, smooth and s.h.i.+ning, the outer peridium gelatinous, thickened by moisture, hyaline; stipe dark brown; columella none; capillitium as in _Didymium_ purplish-brown, colorless at the tips; spores spinulose, fuscous, about 12 .

New Hamps.h.i.+re, Europe.

Our specimens from the late Dr. W. G. Farlow who collected it in New Hamps.h.i.+re. Swollen by immersion in water the sporangia take on an eye-like appearance, oculate, etc.

=EXTRA-LIMITAL=

PHYSARINA _von Hohnel._

1909. _Physarina_ von Hohnel, _Akad. Wiss. Wien; Math-nat. KL._, CXVIII., p. 431.

Sporangium wall rough with blunt spine-like processes, otherwise as _Diderma_.

One species, _op. cit._, p. 432, _P. echinocephala_ v. Hohn.

Java. Might as well be called _Diderma echinocephalum_, one would think.

Structure is that of _Leangium_. The striking character is a surface modification of the outer peridium, according to the description.

ORDER II

=STEMONITALES=