s network it approaches _C. tenella_, and its spores
have the color of the paler form of _C. purpurea_." So Dr. Rex, _l. c._
Western forms of the first-named species have much shorter stipes; the
network in the specimens before us is unlike that of _C. tenella_, but
resembles that of _C. purpurea_.

Rare, on very rotten wood, in the forest. New York, Ohio, South
Carolina, Ontario.

16. CRIBRARIA CUPREA _Morgan._

PLATE XVII., Fig. 7.

1893. _Cribraria cuprea_ Morg., _Jour. Cin. Soc_., p. 16.

Sporangium very small, .33 mm., oval or somewhat obvoid, copper-colored,
stipitate, nodding; stipe concolorous or darker below, subulate, curved
at the apex, 2-4 times the sporangium; calyculus about one-half the
sporangium, finely ribbed and granulose within, the margin nearly even;
the net rather rudimentary, the meshes large, triangular or
quadrilateral, the nodules also large, flat, concolorous, the threads
slender, transparent, with free ends few; spores in mass copper-colored,
by transmitted light colorless, smooth, 6-7 mu.

Recognizable by its small size and peculiar color, that of bright
copper, although this fades somewhat with age, and the metallic tints
are then lacking. Related to the preceding and in specimens having
globular sporangia closely resembling it; but the ground color in _C.
languescens_ is always darker, and the stipe proportionally much longer.
In habit the sporangia are widely scattered, much more than is common in
the species of this genus. Miss Lister, _2nd ed._ regards this as a var.
of No. 15.

Comparatively rare. Before us is one very small colony of sporangia from
Iowa, one from Ohio, and a large number from Missouri. If one may judge
from the material at hand, the favorite habitat is very rotten basswood,
_Tilia americana_.

=2. Dictydium= (_Schrad._) _Rost._

Sporangia distinct, gregarious, globose or depressed-globose, stipitate,
cernuous; the peridium very delicate, evanescent, thickened on the
inside by numerous meridional costae which are joined at frequent
intervals by fine transverse threads more or less parallel to each
other, forming a persistent network of rectangular meshes.

The ribs or costae of the spore-case radiate from the top of the stipe
and unite again at the top of the sporangium in a feeble, irregular net.
Schrader, _Nov. Gen. Pl._, p. 11, 1797, applied the name _Dictydium_ to
all _Cribraria_-like species in which the calyculus was wanting. Fries
follows th