us_ first presents an unmistakable description and
figure.

Maine to the Black Hills and Colorado, and north and west; Alaska to
Nicaragua.

9. ARCYRIA CINEREA (_Bull._) _Pers._

PLATE II., Figs. 3, 3 _a_.

1791. _Trichia cinerea_ Bull., _Champ. de France_, p. 120, Tab. 477,
Fig. iii.
1801. _Arcyria cinerea_ (Bull.) Pers., _Syn. Fung._, p. 184.

Sporangia scattered or gregarious, ovoid or cylindrical, generally
tapering upward, about 2-3 mm. high, ashen gray, sometimes with a
yellowish tinge, stipitate; calyculus very small, thin; stipe about half
the total height, rising from a small hypothallus, thin, gray or
blackish, densely crowded with spore-like cells; capillitium dense,
freely branching, ashen, or yellowish, little wider below, minutely
spinulose; spore-mass concolorous, spores by transmitted light
colorless, smooth, 6-7 mu.

A very common little species, easily recognized by its color and habit.
The capillitium is more dense than in any other species and expands
less. The stipe is about equal to the expanded capillitium, unusually
long. The plasmodium occurs in rotten wood, especially species of
_Tilia_, is gray and, judging from the number of sporangia found in one
place, scanty.

Bulliard, _l. c._, gives the first account of the species by which it
can with any certainty be identified. By some authors _Clathrus
recutitus_ Linn. is cited as a synonym. We fail to distinguish _A.
cookei_ Mass. from the old type.

Widely distributed; Maine to Alaska, and south to Mexico and Nicaragua.

10. ARCYRIA DIGITATA (_Schw._) _Rost._

1831. _Stemonitis digitata_ Schw., _N. A. F._, p. 260, No. 2350.
1868. _Arcyria bicolor_ Berk. & C., _Jour. Linn. Soc._, X., p. 349.
1875. _Arcyria digitata_ (Schw.) Rost., _Mon._, p. 274.

Sporangia compound, that is gathered in tufts, number 3-12 or more on a
single stipe, the clusters themselves scattered; individual sporangia
elongate cylindric, about 3-4 mm. long, ashen gray or nearly white,
stipitate; stipe as long or longer than the sporangium, stout, sometimes
showing traces of consolidation of several, sometimes none, dark brown
or black; capillitium looser and more expanded than in the last, the
threads more strongly spinulose; spore-mass concolorous, spores under
the lens colorless, smooth, globose, 7.5-8 mu

Closely related to the preceding, but different in habit and on the
whole larger and more robust throughout. The stipes in some case