HEMITRICHIA.] TRTCHIACE.E. 177 



has also been found in H. clirysospnra, and occasionally in H. 

 rubiformis. 



Hob. On dead wood. Hitchin, Herts (L:B.M.146) ; Norway 

 (L:B.M.146) ; Iowa (L:B.M.146). 



3. H. clavata Rost., 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- 

 raiigium-wall membranous, minutely papillose on the inner side, 

 yellow. Stalk cylindrical, 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 //, 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 rounded, 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 

 Romer', N. Mag. Bot., i., p. 90 (1794). Arcyria 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; b. 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, b, x 600 (United States) ; /. a portion of the papillose 

 sporangium-wall, x 600 ; fj. sporangium with expanded capillitium, x 20 

 (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 capillitium. The type of Arcyria decipiens 

 Berk., collected by Charles Darwin at Rio Janeiro (K. 1766), is typical 

 H. clavata. 



Hab. On dead wood. Batheaston, Somerset (B. M. 354) ; Dudley, 

 Stafford 

 (K. 134) 



1 X\ X *i O } ^^' V> J X *_/ -Li I L V J.IW_/I . * / < I t t 1 M. ,X. J. f W W I -** V-l- *. V^ V 1 -f-M . *-V - ' - . I t ' y 



Bonin Islands (K. 138) ; Philadelphia (L:B.M.147) ; Iowa (B. M. 831, 

 1024, 1031) ; S Carolina (B. M. 796) ; Cuba (K. 1765A) ; Venezuela 

 (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 - 7 mm. long, 0'05 mm. thick, 

 furrowed, ochraceous-grey, containing spore-like cells. Capillitium 



12 



