HEMITUICHIA.] 
TRTCHIACEiE. 
177 
has also been found in H. cJmjsospora, and occasionally in H. 
rubifarmis. 
Hah On dead wood.-Hitchiu, Herts (L:B.M.146) ; Norway 
(L:B.M.146) ; Iowa (L:B.M.146). 
3. H. clavata Rest., Yersuch, p. 14 (1873). Plasmodium 
watery-white, in dead wood. Total height 1 to 3 mm. Sporangia 
clavate or turbinate, rarely globose, stalked, gregarious, 0-7 to 
1-5 mm. high, shining, ochraceous or olivaceous-yellow; spo- 
rangium-wall membranous, minutely papillose on the inner side, 
yellow. Stalk cylindi-ical, 0-3 to 1 -5 mm. long, furrowed or nearly 
even ; olive, red-brown, or nearly black ; hollow, filled with spore- 
like cells. Capillitium a network of yellowish-olive, branched 
threads, 5 to 6 /x, diam., marked with five to six well-defined 
spiral bands 1 //, wide, with intervals of 1 to 1-5 //., usually 
velvety in profile, sometimes spinose in parts in imperfect develop- 
ments ; free ends roLinded, either few or numerous. Spores 
ochraceous, minutely warted, 8 to 10 /x diam. — Hemiarcyria 
clavata Rost., Mon., p. 264 (1875); Cooke, Myx. Brit., p. 68; 
Blytt, Bidr. K. Norg., Sop. iii. (1892), p. 13 ; Macbride, in Bull. 
Nat. Hist. Iowa, ii., p. 134. Trichia clavata Pers., in 
Rbmer, N. Mag. Bot., i., p. 90 (1794). Arcy'ria clavata Mass., 
Mon., p. 165. Hemiarcyria stipitata Mass., in Journ. R. Micr. 
Soc. (1889), p. 354. Arcyria stipitata Mass., Mon., p. 163. 
Arcyria decipiens Berk., in Ann. Mag. Nat. Hist., Ser. 1, ix., 
p. 447. 
Plate LXIV., A. — a. sporangia, x 20; &. capillitium, x 600; c. spores, 
X 600 (England) ; d. sporangia developed in cold weather, x 20 ; e. capilli- , 
tium of same, beset with spines appearing in limited tracts among threads 
of the usual form, h, x 600 (United States) ; /. a portion of the papillose 
sporangium-wall, x 600 ; g. sporangium with expanded capillitium, x 2 0 
(United States). 
The type specimen of Arcyria stipitata Mass., from Java (K. 1768), . 
is an unusually long stalked but typical form of H. clavata, apparently 
without free ends to the capilUtium. The type of Arcyria decipiens 
Berk., collected by Charles Darwin at Rio Janeiro (K. 1766), is typical 
H. clavata. 
Hah. On dead wood. — Batheaston, Somerset (B. M. 354) ; Dudley, 
Stafford (L:B.M.147) ; Lyme Regis, Dorset (L:B.M.147) ; France 
(K. 134) ; Germany (B. M. 792, 794); Poland (Strassb. Herb.) ; Natal 
(K. 148) ; Ceylon (K. 1765) ; Java (K. 1768) ; Borneo (L:B.M.147); 
Bonin Islands (K. 138) ; Philadelphia (L:B.M.l47) ; Iowa (B. M. 831, 
1024, 1031) ; S Carolina (B. M. 796) ; Cuba (K. 1765a) ; Yenezusla 
(K. 1767) ; Rio Janeiro (K. 1766) ; French Guiana (Paris Herb.) ; 
Paraguay (Paris Herb.) ; Chili (Paris Herb.). 
4. H. leiocarpa Lister. Plasmodium? Total height 1-5 mm. 
Sporangia obovoid, rarely subglobose, pale grey or ochraceous- 
grey, 0*7 mm. diam. ; sporangium-wall evanescent above ; the cup 
membranous, smooth, colourless, longitudinally plicate, minutely 
and transversely wrinkled. Stalk 0'7 mm. long, 0-05 mm. thick, 
furrowed, ochraceous-grey, containing spore-like cells. Capillitium 
12 
