226 ENDOSPOREAE [HEMITRICHIA 



10 fx diam. — Macbr. X. Am. Slime-Moulds, 206. Trichia 

 clavata Pers. in Roemer N. Mag. Bot., i. 90 (1794). T. citrina 

 Schura. Enum. PI. Saell., ii. 209 (1803) ? T. cbtusa Wigand 

 in Pringsh. Jahrb. Wissensch. Bot., iii. 30, t. 2, f. 4 (1863). 

 Arcyria decipiens Berk, in Ann. Mag. Nat. Hist., ser. 1, ix. 447 

 (1842). A. clavata Mass. Mon., 165 (1892). A. calyculata 

 Mass. I.e., 162. A. stipitata Mass. I.e., 163. A. leocarpoides 

 Mass. I.e., 167. Hemiarcyria clavata Rost. Mon-, p. 264 (1875). 

 H. calyculata Speg. in Ann. Soc. Cient. Argent., x. 152 (1880). 

 //. stipitata Mass. in Journ. R. Micr. Soc.. 1889, 354. 

 H. ablata Morgan Myx. Miami Valley, 30 (1893). H. funalis 

 Morg. I.e., 32. H. plumosa Morg. I.e., 29. Comuvia 

 leocarpoides Speg. I.e., xii. 256 (1881). Hemitrichia stipitata 

 Macbr. N. Am. Slime-Moulds, 207 (1899). H. montana 

 Morgan ex Macbr. I.e., 208. 



PI. 167. — a. sporangia ; 6. capillitium ; c. spores (England) ; d. sporangia developed 

 in cold weather (Philadelphia) ; e. capillitium of same showing spines, appearing 

 among threads of the usual form, also fragment of sporangium-wall ; /. sporangium 

 with expanded capillitium. 



This abundant and widely distributed species is, on the whole, 

 remarkably constant in its main characters. At the same time, as 

 Dr. Rex has noted, it is subject to some variation depending on climate, 

 the season of the year, and on altitude. He writes (Bot. Gaz., xv. 

 315) : " Hemiarcyria clavata developed in the hot days of July and 

 August will erect quickly into scattered, globose, long-stiped spor- 

 angia which rupture immediately as they dry, leaving scarcely a 

 vestige of a receptacle, while the same species late in October will 

 develop closely aggregated, obovate, almost clavate sporangia, nearly 

 sessile or with quite short stipes, which rupture slowly several days 

 after maturity, leaving a very deep funnel-shaped receptacle." The 

 presence of free ends to the capillitium threads is not an unusual 

 character, although in the most perfect developments they are usually 

 absent. A gathering made by Dr. Sturgis in the Adirondack Mountains, 

 New York, in September, 1901, shows many free ends amongst the 

 tangle of capillitium, and has also a number of short free elaters. 

 The type of H. montana Morgan from the San Bernadino Mountains, 

 California, appears to be an irregular form of the present species ; 

 the sporangia are shortly stalked or sessile, the capillitium is much 

 branched and has many free ends, and although in some parts the 

 spirals are regular, in others they are loose and rugged ; the spor- 

 angium-wall is not papillose as in normal growths, but is marked 

 with a delicate network resembling fan-tracery ; similar markings 

 associated with papillse appear in a specimen from Chili gathered by 

 Prof. Thaxter (B.M. slide). The type of Arcyria stipitata Mass. from 

 Java, is a perfectly formed long-stalked specimen of H. clavata, with no 

 free ends to the capillitium. The type of Arcyria decipiens Berk., 

 collected by Charles Darwin at Rio Janeiro (K. 1766) is also a typical 

 form of the present species. 



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

 Stafford (B.M. 1484) ; Lyme Regis, Dorset (B.M. slide) ; Ivinghoe, 

 Bucks (B.M. 1485) ; Bushey, Herts (B.M. 2987) ; France (K. 134) ; 

 Germany (B.M. 792) ; Sweden (B.M. 2988) ; Poland (Strassb. Herb.) ; 



