178 
ENDOSPOREiE. 
[hemitrichia. 
a network of fi-equently branching pale grey threads, 2 to 
5 fjL thick, marked with three to five often prominent spiral 
bands, sometimes smooth, but in many parts beset with numer- 
ous spines about 2 [x long ; free ends subclavate, usually 
spinulose. Spores smooth, pale grey in mass, 6 to 8 yu, diam. — 
Hemiarcyria leiocarpa Cooke, in Ann. Lyc. Nat. Hist. N. York, xi., 
p. 405 (1877); Myx. Brit., p. 88, figs. 252, 255. Hemiarcyria 
Varneyi Rex, in Proc. Acad. Nat. Sc. Phil. (1891), p. 396. 
Plate LXIV, , B. — a. sporangia, x 20 ; J. portion of cup of sporangium- 
wall, X 600 ; c. capillitium, x 600 ; d. spore, x 600 (Maine, U.S.A. : part 
of type). 
This species is closely allied to H. clavata, differing in the pale 
colour, in the smooth colourless sporangium-wall, the smooth spores, 
and in the spiaose tracts of the capillitiurn, which in II. clavata is an 
exceptional character. H. Varneyi Rex has a more elongated spo- 
rangium and a shorter stalk ; but, in comparing the specimen kindly 
furnished by Dr. Rex with the type of leiocarpa^ the other characters 
appear to be identical. 
Hah. On dead wood.— Maine, U.S.A. (L:B.M.147a) ; Kansas 
(L:B.M.147a slide). 
5. H. Wigandii Lister. Plasmodium rose-red. Sporangia 
subglobose or turbinate, sessile, rarely shortly stalked, crowded 
or gregarious, 0'4 to 0'7 mm., opaque or shining, yellow, yellow- 
brown, or ochraceous ; sporangium-wall memljranous, yellow, 
smooth. Capillitium a tangle of sparingly branched, ochraceous- 
yellow threads, 3 to 5 //- diam., marked with one to three prominent 
bands, forming an irregular loose spiral, with few rounded or 
bulbous free ends. Spores yellow, minutely warted, 9 to 12 /x 
diam. — Hemiarcyria Wigandii Rost., Mon., p. 267 (1875); Cooke, 
Myx. Brit., fig. 232. Acryria Wigandii Mass., Mon., p. 163. 
Trichia nana Mass., in Journ. R. Micr. Soc. (1889), p. 336 ; 
Mass., Mon., p. 181. 
Plate LXIV., B.— e. sporangia, x 20;/. capillitium, x 600; g. spore, 
X 600 (Germany : Rostafinski's type) ; li. sporangia, x 20 (United States). 
The type specimen of Trichia 7iana Mass., from Westbrook, Maine 
(K. 1164), is H. Wigandii, agreeing perfectly with Rostafinski's type 
from Freiburg in the loose capillitium, with one or two lax and 
irregular spiral bands ; the sporangia measure 0-3 to 0-5 mm. diain. 
In extensive gatherings made in Norway, on fir wood, some sporangia 
have short slender stalks filled with spore-like cells. 
Hab. On dead wood.— Germany (Strassb. Herb.); Norway (L:B.M. 
148) ; Mass., U.S.A. (L:B.M.148) ; Maine (K. 1164). 
6. H. Karstenii Lister. Plasmodium? Sporangia forming 
elongated, curved plasmodiocarps, 0-3 to 0-5 mm. broad, or sub- 
globose, sessile ; pale brown, red, or purplish-brown ; mass of 
capillitium and spores yellow or orange-red; sporangium- wall 
thickened with deposits of granular matter. Capillitium a tangle 
of branching yellowish or reddish-brown thi-eads, 3 to 5 /a diam., 
