trichia] trichiaceae 211 



Canada (B.M. 2871); Maine, U.S.A. (B.M. 1617); Philadelphia (B.M. 

 1903a); Colorado (B.M. 2872); Peru (B.M. 2873). 



5. T. scabra Rost. Mem., p. 258 (1875). Plasmodium 

 watery-white. Sporangia sessile, globose, usually crowded 

 and seated on a membranous hypothallus, 0*6 to 0-9 mm. diam., 

 shining, orange-yellow, olivaceous or yellow-brown ; sporan- 

 gium-wall membranous, yellow, marked with faint lines of 

 minute warts. Capillitium and spores in mass bright orange- 

 yellow. Capillitium of long cylindrical bright yellow 

 elaters, 4 to 6 /a diam., marked with four or five often 

 somewhat irregular spiral bands, studded with spines or 

 nearly smooth, the ends acutely conical or with the bands 

 produced at the apex in more or less diverging points ; longi- 

 tudinal striae rarely evident. Spores yellow, minutely and 

 closely reticulated with shallow bands forming a complete 

 or fragmentary net with about forty meshes to the hemisphere, 

 rarely irregularly warted, 9 to 12 /x diam. — Mass. Mon., 192 ; 

 Macbr. N. Am. Slime-Moulds, 213. Trichia minima Mass. in 

 Journ. R. Micr. Soc, 1889, 336 ; Mass. Mon., 182. Trichia 

 nitens Fries in MS. ; Mass. in Journ. R. Micr. Soc, 1889, 333 ; 

 Mass. Mon., 179. Arcyria Buchialli Mass. I.e., 161. Oligonema 

 aeneum Karst. in Bidr. Kann. Finl. Nat., iv. 131 (1879) ? 

 Comuvia anomala Karst I.e. ? 0. fulvum Morg., Myx. Miami 

 Valley, 42 (1893). Ophiotheca anomala Mass. I.e., 135 ? 



PI. 159. — c. sporangia (England) ; d. spores and elaters ; one of the latter shows 

 regular, the other irregular spiral bands. 



The type of Arcyria Bucknalli Mass., from Bristol (K. 1774), is an 

 interesting form of the present species ; the capillitium is spinose, and 

 consists of long sparingly branched free elaters, not combined into a 

 network ; the spiral bands are in many parts entirely modified into 

 rings, a character which is often seen in some degree in imperfect 

 developments of this species ; the spores are of the typical form of T. 

 scabra. A specimen from Luton (B.M. slide) has the dense net of 

 a Hemitrichia and no free elaters ; the close and rugged spirals on 

 the threads have in some parts an annular arrangement ; it is, however, 

 an undoubted form of the present species ; the spores are typical. The 

 type of T. minima Mass., from Oldham (K. 1044), has spinulose elaters 

 4 to 5 jx diam. ; the spores measure 9 \x ; some are delicately reticulated, 

 in others the net is broken into warts and short bands ; it is not an 

 unusual form of T. scabra. The type of T. nitens Fr. from Upsala 

 (K. 1104) has spores 9 to 10 ^ diam., for the most part closely 

 reticulated, but some have the bands much broken ; the elaters 

 measure 4 to 5 ft diam., with regular spiral bands and only a few short 

 scattered spines ; it appears to be a typical form of T. scabra, except 

 that the elaters are rather more smooth than usual. The type of 

 Oligonema fulvum Morgan, from Preston, Ohio (B.M. slide) is also 

 T. scabra ; the scanty capillitium consists of short, rather irregularly 

 formed elaters, some of which have the usual spiral markings, while 

 others are nearly or quite smooth ; the sporangium-walls are beautifully 

 iridescent ; the spores are marked with the characteristic close 

 reticulation, and measure 10 to 13 /a diam. 



