TllICHIA.] TRICHIACE^. 167 
A form with the ends of the elaters obtuse, and the spiral bands 
continued at the apex into widely diverging spines, has been named 
T. ahmpta Cooke, but this character is also found occasionally in 
T. favvginea, T. affinis, and T. scahra. T. proximella Karsten and 
T. sulphurea Mass. have elaters 4-5 to 5 /x diam., and spores with the 
bands much broken ; T. Balfourii Mass. has the elaters 4 to 5 /a diam., 
and the reticulation on the spores consists of wide, broken and pitted 
bands. They present no character by which they can be separated from 
T. persimilis. 
Hah. On dead wood, leaves, etc. — Batheaston, Somerset (B. M. 367) ; 
Penzance (B. M. 370) ; Epping Forest, Essex (L:B.M.136) ; Lyme 
Regis, Dorset (L:B.M.136) ; Boynton, Yorkshire (B. M. 1125) ; Glamis, 
Scotland (B. M. 369) ; Germany (Strassb. Herb.) ; France (K. 1183) ; 
Finland (L:B.M.136 slide) ; Cape (K. 1047) ; Ceylon (K. 1749) ; Java 
(K. 1755) ; Philadelphia (L:B.M.136). 
5. T. scabra Eost., Men., p. 258 (1875). Plasmodium watery- 
white, in rotten wood. Sporangia globose, crowded, seated on a 
common membranous hypothallus, 0'6 to 0"9 mm. diam., shining, 
yellow-brown. Capillitium and spores in mass bright orange- 
yellow. Capillitium of long, cylindrical bright yellow elaters, 4 
to 6 /A diam., with four or five bands arranged in somewhat 
ii'regular spirals, either close or distant, beset with spines, or 
nearly smooth, the ends acutely conical or with the bands pro- 
duced at the apex in more or less diverging points, longitudinal 
striae rarely evident. Spores yellow, minutely reticulated with. 
depressed bands forming a complete or fragmentary net with 
about forty meshes to the hemisphere, or irregularly warted, the 
spore border being reduced to a spinulose margin, 9 to 11 yu, diam. 
—Cooke, Myx. Brit., figs. 214, 239 ; Blytt, Bidr. K. Norg., Sop. iii. 
(1892), p. 13 ; Macbride, in Bull. Nat. Hist. Iowa, ii., p. 132 ; 
Mass., Mon., p. 192. Trichia minima Mass., in Journ. E,. Micr. 
Soc. (1889), p. 336 • Mass., Mon., p. 182. Trichia nitens Fries, 
Mass., in Journ. R. Micr. Soc. (1889), p. 333 ; Mass., Mon., p. 179. 
Arcyria Bucknalli Mass., Mon., p. 161. 
Plate LX., A..—d. sporangia, x 20 ; e. & 6. elaters, x 600 : /. spore, x 
600 (England). 
The type of Arcyria Bucknalli Mass., from Bristol (K. 1774), is an in- 
teresting form of T. scabra ; 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 cha- 
racter which is often seen in a less degree in imperfect developments 
of this species ; the spores are of the typical form of T. scabra The 
specimen from Luton (L:B.M.137) has the dense net of a Hemitriclua 
and no free elaters ; the close and rugged spirals on the threads have 
m some parts an annular arrangement ; it is, however, an undoubted 
form of T. scahra with typical spores. The type of T. minima Mass , 
from Oldham (K. 1044), has .spinulose elaters 4 to 5 /x diam. ; the spores 
measure 9 /z, some are delicately reticulated, in others the net is broken 
into warts and short bands ; it is not an unusual form of T. scahra A 
type specimen of T. nitens (K. 1104) has spores 9 to 10 /a diam., for 
the most part delicately reticulated, but some have the bands much 
broken ; the elaters measure 4 to 5 /i diam., with regular spiral 
