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Ill
Tlie stipitate sporangia and elastically protruded capillitium
attached at the base, as also the spiral markings on the threads
prove the present species to he an Arcyria, in whicli genus
free arms to the capillitium are frequent in several species.
Arcyria Karsteni, Rost.
Sporangia effused, vermiform, sinuous, sometimes forming
irregular reticulations, or hemispherical, scattered, and sessile
on a broad base, varying from dirty oohraceous brown to dark
chestnut; mass of capillitium and spores dingy ochre; threads
often irregularly branched, and forming a very loose net, 3—4 g
thick, toith scattered, inflated portions 12—15 g thick, and
30—50 g long, spircds very indistinct, a few scattered rudimentary
spines now and then present, free tips not distinctly attenuated,
usually abrupt or clavate; spores globose, smooth, 12— 12 g
diameter.
Ilemiarcyria Karsteni, Rost., Mon. Suppl., p. 41; Karst.,
Myx. Fenn., iv., p. 142; Schroeter, p. 115; Saco., Syll., vii., 1,
n. 1516; Mass., Rev. Trich., p. 342, fig. 36.
(Specimen from Ceylon in Herb. Berk., named hy Rostafinski.)
On wood. Finland ; Silesia; Ceylon.
Characterized by the threads of the scanty capillitium being
considerably swollen at intervals, and by the indistinct spirals.
Arcyria pusilla, Mass.
Sporangia rather closely gregarious, suhcylindrico-elliptical,
0'4—0'5 mm. higli, 0'15—0'25 mm. diameter, rather obtuse
above, abruptly subtruncate below, with only a trace of a stem
or altogether without;, at first hlood-red with an amber tinge,
afterwards rose-colour; capillitium rather dense, forming a rose-
coloured network, threads round, 3—4 g thick, spirals three or
four, furnished with minute spinules; spores rose or flesh-colour,
globose, smooth, 7—9 g diameter.
Hemitrichia pnisilla, Speg., Fung, Arg. Pug., IV., n. 269.
Hemiarcyria pusilla, Berlese, Sacc., Syll., IV., 1, n. 1512;
Mass., Rev. Trich., p. 352.
On bark. Argentine Republic.
Arcyria fuliginea, Cke. and Mass. (fig. 113).
Sporangia (?), mass of capillitium and spores smoky-olive,
threads round, 6— 7 g diameter, tldckly and equally covered with
slender spines 3— 4 g long, combined to form a dense, irregular
network; spores globose, smooth, 8 g diameter.
Hemiarcyria fidiginca, Cke. and Mass., Grev., vol. xvi., p. 74.
On living leaves. Mount Wilson, N. S. Wales.
Nothing is known of the sporangium, which had been completely
crushed and lost; capillitium forming a large mass
spreading over the leaves. May possibly prove to be a broadly
effused, plasmodiocarp form of an Ophiotheca.
Sub-sect. Teicheae.
Oligonema, Rost.
Wall of sporangium single, dehiscing irregularly; caj)lllitium
scanty, composed of free, simple or branched elaters, furnished
with ring-like thickenings, or a single very diffuse, rudimentary
spiral, tips obtuse.
Oligonema, Rost., Mon., p. 291; Cooke, Myx. Brit., p. 77;
Sacc., Syll, p. 486 ; Mass., Rev. Trich., p. 21.
Agreeing with the genus Trichia in having the elaters perfectly
free, but readily distinguished by the rudimentary markings
on their walls, never having more than a single, indistinct,
very open spiral, which may be present on one portion of an
elater and absent on another part, or not unfrequently altogether
absent from all the elaters of one sporangium, and present
on some of those from another sporangium taken from the
same group. A second type of ornamentation on the walls
of the elaters in the present genus consists of annular or
riug-like thickenings, which present the appearance of thin,
flat discs, rather larger than the diameter of the elater, and
placed at right angles to its long axis. These ring-like thickenings
are very unequally distributed, five or six being sometimes
met with at unequal distances on au elater, whereas they may