most percurrent. 15. _C. subcaespitosa_

1. COMATRICHA CAESPITOSA _Sturgis._

PLATE XI., Figs. 12, 13, 14.

1893. _Comatricha caespitosa_ Sturg., _Bot. Gaz._, XVIII., p. 186.
1894. _Diachaea thomasii_ Rex, var., List., _Mycetozoa_, p. 92.
1899. _Comatricha caespitosa_ Sturg., Macbr., _N. A. S._, p. 124.
1911. _Diachaea caespitosa_ Lister, _Mycetozoa, 2nd ed._, p. 121.

Sporangia densely crowded or cespitose, sub-sessile or short stipitate,
clavate, 1-1.5 mm. high, the peridium gray, iridescent with blue tints,
comparatively permanent but finally disappearing; columella attaining
two-thirds to three-fourths the height of the sporangium, giving rise
throughout its length to the dense blackish capillitium; hypothallus
delicate, inconspicuous; capillitium, the main branches thick at the
point of origin, frequently anastomosing, and becoming gradually thinner
toward the surface of the sporangium, the tips pointed, free, forming
the network; spores blackish-violet in mass, by transmitted light pale
brownish-violet, rough, 9.5-13 mu.

A very distinct and curious species. The sporangia are densely crowded,
though by the nature of habitat somewhat tufted. The shape of the
individual sporangium is quite uniformly clavate or obovate, decidedly
truncate above. The spores are uniformly verruculose and plainly
unequal.

This species, as indicated, was by its author described as a comatricha.
To transfer it to another genus seems idle, especially when long
established generic boundaries must be seriously disturbed expressly to
admit the new arrival.

New England, North Carolina, on moss and lichens.--_Dr. Sturgis._

2. COMATRICHA CYLINDRICA (_Bilgram_) _Macbr._

1905. _Diachaea cylindrica_ Bilgram, _Proc. Acad. Nat. Sci. Philad._,
524.
1911. _Diachaea cylindrica_ Bilgram, List., _Mycetozoa, 2nd ed._,
p. 121.

Sporangia cylindrical with obtuse apex, sessile, gregarious,
iridescent, steel-gray or bronze, 1 to 1.7 mm. high, .5 to .65 mm.
thick; hypothallus whitish, rugose; sporangium-wall membranous, hyaline,
not adhering to the capillitium; columella arising from the hypothallus
and extending nearly to the apex, brown, very light and semi-translucent
near the base, irregular, flexuous, limeless throughout; capillitium
brown, radiating from the columella to the periphery, repeatedly
branching and anastomosing; spores warted, the warts connected by ridges
forming a more or less perfect