IIEMITRICIIIA.] 
TUlCPlIACE/ii!. 
179 
marked with three to five indistinct spii-al bands, often with 
scattered ring-shaped thickenings and irregular expansions ; free 
ends pointed or blunt. Spores yellow, minutely warted, 9 to 15 
diixm. —Nemiarcyria Karstenii Rost., Mon., App., p. 41 (1876). 
Arcyria Karstenii Mass., Mon., p. 168. Hemiarcyria paradoxa 
Mass., in Journ. R. Micr. Soc. (1889), p. 356. Arcyria paradoxa 
Mass., Mon., p. 160. Hemiarcyria obscicra Rex, in Proc. Acad. 
Nat. Sc. Phn. (1891), p. 395. 
Plate LXV., A— a. plasmodiocarp, x 20 ; portion of sporangium-wall, 
showing the granular outer and membranous inner layers, x 280 ; c. capilli- 
tium and spores, x 280 ; d. capillitium, x 600 ; e. spore, x 600 (England). 
This species appears to be a Hemitrichia form of Trichia contorta, 
which it resembles in every respect, except that the capillitium threads 
are combined instead of forming free elaters ; the same variety in 
shape and colour of the sporangia, and in the markings and colour of 
' the capillitium, occur as in that species. Rostafinski's type specimen 
from Ceylon (K. 1773) has pale yellow-brown sporangia and rugged 
capillitium, with faint spirals and many large rounded expansions ; 
the spores are yellow, minutely warted, and measure 10 to 11 /j. diam. 
Specimens from near Dudley, found by Mr. Camm, have both globose 
and plasmodiocarp purple-brown sporangia and orange-brown capilli- 
tium, strongly contrasting with the yeUow spores. The type specimen 
of Arcyria x>aradoxa Mass., from Weybridge( K. 132), closely resembles 
the Ceylon gathering of H. Karstmii, only differing in the more 
regular, less branched capillitium, with fewer expansions ; it must 
therefore be included under that species. The mounting of Hemiar- 
cyria obscura Rex, I.e. (L:B.M. 149), furnished by Dr. Rex, shows a dull 
yellowish-red capillitium ; the threads are 2'6 to 3 ^ thick, and are 
marked with close faint spirals ; they have nearly the same colouD 
as those of the Dudley specimen, but are more uniform, with incon- 
spicuous swellings ; the spores are similar to those of the type of 
H. Karstenii at Kew, and there appears to be no specific character to 
separate it from that species. 
Hah. On dead leaves.— Dudley, Stafford (L:B.M.149); Weybridge, 
Surrey (K. 132) ; Ceylon (K. 1773) ; Montana, U.S.A. (L:B.M.149 
slide). 
7. H. Serpula Rost., Versuch, p. 14 (1873). Plasmodium? 
Sporangia forming elongated, winding, branched plasmodiocarps, 
0"4 to 0*6 mm. wide, usually combined to form a close net, golden- 
yellow; sporangium- wall of two layers, yellow. Capillitium a 
tangle of twisting, sparingly branched, yellow threads, 5 to 6 
diam., marked with three to four well-defined regular spiral 
bands 0-7 fx wide, with intervals of 1 to 2 /x,, strongly 
spinose ; longitudinal striae often distinct ; free ends pointed. 
Spores yellow, reticulated with narrow bands, forming a net with 
about nine meshes to the hemisphere, 10 to 12 fx diam. ; border 
0*5 to 1 /iwide. — Hemiarcyria Serpula Rost., Mon., p. 266 (1875) ; 
Cooke, Myx. Brit., p. 68, figs. 200, 227, 228 ; Macbride, in Bull. 
Nat. Hist. Iowa, ii., p. 135. Mucor Serpula Scop., PI. Carn., 
Ed. 2, ii., p. 493 (1772). Trichia Serpula Pers., in ROmer, N. 
Mag. Bot., i., p. 90 (1794). Arcyria Serpula Mass., Mon., 
p. 164. 
