Semitrichia.] triChiace^. 179 



marked with three to five indistinct spiral bands, often with 

 scattered ring-shaped.thickenings and irregular expansions ; free 

 ends pointed or blunt. Spores yellow, minutely warted, 9 to 15 /i 

 diam. — Hemiarcyria 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 obscura Rex, in Proc. Acad. 

 Nat. Sc. PhU. (1891), p. 395. 



Plate LXy., A. — a. plasmodiooarp, x 20 ; 5. portion of sporangium- wall, 

 showing tlie gi'anular outer and membranous inner layers, x 280 ; o. capilli- 

 tium and spores, x 280 ; d. oapillitium, 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 capiUitium 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 oapillitium, occur as in that species. Eostafinski's type specimen 

 from Ceylon (K. 1773) has pale yellow-brown sporangia and rugged 

 capiUitium, with faint spirals and many large rounded expansions ; 

 the spores are yellow, minutely warted, and measure 10 to 11 jn diam. 

 Specimens from near Dudley, found by Mr. Camm, have both globose 

 and plasmodiooarp purple-brown sporangia and orange-brown capiUi- 

 tium, strongly contrasting with the yellow spores. The type specimen 

 of Arcyria paradoxa Mass., from Weybridge( K. 132), closely resembles 

 the Ceylon gathering of H. Karstenii, only differing in the more 

 regular, less branched capUlitium, 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 

 yeUowish-red capilhtium ; the threads are 25 to 3 fi thick, and are 

 marked with close faint spirals ; they have nearly the same colour 

 as those of the Dudley specimen, but are more uniform, with incon- 

 spicuous swelhngs ; 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. 



Hab. 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 plasmodioearps, 

 0*4 to 0'6 mm. wide, usually combined to form a close net, golden- 

 yeUowj sporangium-wall of two layers, yellow. Oapillitium a 

 tangle of twisting, sparingly brapched, yellow threads, 5 to 6 /* 

 diam., marked with three to fpur well-defined regular spiral 

 bands 0-774 wide, with intervals of 1 to 2 /«., 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 /a diam. ; border 

 0-5 to 1 /A wide. — 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. Muayr Serpula Scop., i?l. Carn., 

 ,Ed. 2, ii., p. 493 (1772). Trichia Serpula Pers., in Rpmer, N. 

 Mag. Bot., i., p. 90 (1794). Arcyria Serpula Mass., Mon., 

 p. 164. 



