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From 3—4 mm. high; several sporangia fasciculate on a
common stem, rarely simple. Closely allied to Arcyria cinerea,
differing in the larger size of the sporangia. Sometimes the
capillitmm and spore.s are brownish or red.
(Rostafinski’s Synonyms.)
Stemonitis digitata, Sz., Amer., f., n. 2350 (1834).
Arcyria Lepricurii, Mont., Ann. Sci. Nat., v. iii., p. 141,
no. 603 (1855).
Arcyria Cookei, Mass. (n. sp.).
Gregarious; every part bluish-grey; sporangia narrowly
cylindrical, elongated, wall very thin except the basal portion
which persists as a shallow calyculus; stem erect, elongated,
very slender, &ipaa\, filled with irregular lumps of organic matter;
capillitium dense, becoming protruded elastically during dehiscence
and remaining erect, innermost threads very thin,
I'O— 2 g smooth, comhined to form a very large-meshed, irregular
network, outer threads 4—5 g tliick, densely and uniformly
ccmered with minute warts, forming a small-meshed network;
spores globose, smooth, 8—9 g diameter.
On wood. Brazil.
(Type in Herb., Kew.)
From 3'5—4 mm. h ig h ; stem about equal in length to
sporangium. Placed by Dr. Cooke along with Arcyria cinerea,
from which it differs in the thin, elongated sporangium, the
details of the capillitium, and in the thin long stem being
filled with amorphous lumps of organic matter.
Arcyria dictyonema, Eost.
Sporangia ovate, stipitate; stems springing in clusters from
the substratum, capillitium not very much divided, threads
cylindrical, width variable, generally 3'5 g thick, sub-egually
covered with an elevated network, the bands of which arc spinulose,
spines 1—2 g high; spores smooth, 9—10 g diameter.
Arcyria dictyonema, Rost., Mon., p. 279, fig. 195 ; Cke., Myx.
Brit., fig. 195; Sacc., Syll, vii., 1, n. 1469.
Russia; Germany. .
Appears to approach very closely some forms of A. cinerea
and A. nutans.
(Rostafinski’s Synonyms.)
Arcyria nutans, (a) sordide ochracea. Bong., m Wein., 1. c.,
p . 609 (1836).
Arcyrici ochracea^ D. By., MS.
ATcyTici ciTiTKimomcci, Kaulfuss, MS.
Arcyria Hariotii, Mass. (n. sp.).
Gregarious or much crowded and irregularly polygonal from
mutual pressure, depressed, sessile on a broccd base, sporangial wall
■primrose-yellow, smooth, shining, capillitium and mass of spores
dinc^y yellow; threads of capillitium 6 - 8 diameter, forming
a dense, irregular net, uniformly and densely covered with minute
warts; spores globose, wall thick, smooth, 7 - 9 g diameter.
France. Communicated by M. Hariot of the Paris Museum
On decayed wood. About '5 mm. diameter, superficially
closely resembling Oligonema nitens. Agrees in the smooth
spores, dense capillitium, and polished sporangium with Areyria
versicolor, but in the latter the sporangium is clavate or elong^o-
pyriform, and the markings of the capillitium consist of short
irregularly arranged bands.
Arcyria aurantiaea, Raunk.
Sporangia gregarious, ovate, or shortly cylindrical, stipitate;
stem same length or shorter than sporangium. Thickenings
on the inner side of the receptacle, in the form of fine warts;
wall, capillitium, and mass of spores brick-red to orange, lubes
of the capillitium with irregularly connected, close-standing,
ring-like thickenings, 5— 7 g broad; spores smooth, 10— 11 g
diameter.