228 ENDOSPOREAE [HEMITRICHIA 



threads, 3 to 5 /x 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. — Trichia abietina Wigand in Pringsh. Jahrb. Bot., 

 iii. 33, t. ii, fig. 11 (1863). T. nana Mass. in Journ. R. Micr. 

 Soc, 1889, 336 ; Mass. Mon., 181. Hemiarcyria Wigandii 

 Rost. Mon., p. 267 (1875). Arcyria Wigandii Mass. I.e., 163 

 (1892). Hemitrichia ovata Macbr. N. Am. Slime-Moulds, 202 

 (1899). 



PI. 168. — e. sporangia ; d. capillitium and spore (Germany) ; e. sporangia (United 



This species somewhat resembles the occasional Hemitrichia 

 forms of Trichia varia, but is distinguished by the stalks when present 

 being filled with spore-like cells, by the often well defined cup-like base 

 of the sporangium-wall, and by the flaccid capillitium marked with 

 slender spiral bands that are not more prominent on one side of the 

 thread. The type of Trichia nana Mass. from Westbrook, Maine 

 (K. 1164) is a sessile form of H. abietina. Rostafinski refers to having 

 seen a specimen of this species in Persoon's herbarium named Trichia 

 ovata, in consequence of which Prof. Macbride, in view of adopting the 

 earliest specific name, has called the present species Hemitrichia 

 ovata ; Persoon's description of T. ovata, however, applies better to 

 T. favoginea, and Rostafinski was probably right in including Trichia 

 ovata under the latter species. 



Hob. On dead wood of fir, beech, etc. — Uplyme, Devon (B.M. 

 2995) ; Swarraton, Hants (B.M. 2996) ; Holstein (B.M. 2997) ; 

 Norway (B.M. 1487) ; Portugal (B.M. 2998) ; Cambridge, Mass (B.M. 

 1488); Maine, U.S.A. (K. 1164); Colorado (B.M. 2274). 



8. H. Karstenii Lister Mycetozoa, 178 (1894). Plasmo- 

 dium watery-whi t. Sporangia sessile, scattered, subglobose 

 or forming elongated curved plasmodiocarps, 0-25 to 0*5 mm 

 broad, pale yellowish-brown, red- or purplish-brown ; sporan- 

 gium-wall of two layers, membranous or cartilaginous, the outer 

 layer thickened with deposits of granular matter. Capillitium 

 a loose network of branching yellowish or reddish-brown 

 threads, 3 to 5 /<, diam., marked with three to five more or less 

 distinct spiral bands, rarely smooth, often with scattered ring- 

 shaped thickenings and irregular expansions ; free ends 

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

 diam.— Macbr. N. Am. Slime-Moulds, 202 ; Torrend PI. 

 Myx., 105. Hemiarcyria Karstenii Rost. Mon., App. p. 41 

 (1876). H. paradoxa Mass. in Journ. R. Micr. Soc, 1889, 356. 

 H. obscura Rex in Proc. Acad. Nat. Sci. Phil., 1891, 395. 

 Arcyria Karsteni Mass. Mon., 168 (1892). A. paradoxa Mass. 

 I.e., 160. rerichaena cornuvioides Cel. fil. Mvx. Bohm 26 

 PL i, figs. 6, 7 (1893). 



PI. 171. — o. plasmodiocarp ; b. capillitium and spores with fragment of sporangium- 

 wall ; c. capillitium ; d. spore. 



H. Karstenii appears to be a Hemitrichia form of Trichia contorta, 

 a species which it resembles in every respect, except that the capillitium 



