HEMITRICHIA.] 
TRICHIACE^. 
175 
• KEY TO THE SPECIES OF HEMITRICHIA. 
A. Spores nearly smooth, or minutely warted : — 
A. Capillitium red, spinose. I. H. rubiformis 
B. Capillitium yellow or yellow-brown — 
a. Sporangia stalked — 
Stalk solid. 2. H. intorta 
Stalk hollow, filled with spore-like cells — 
Cup papillose. 3. H. clavata 
Cup smooth. 4. H. leiocarpa 
h. Sporangia sessile — 
Spirals of capillitium one to three, prominent, 
sporangium-wall membranous. 
5. H. Wigandii 
Spirals of capillitium three or more, indistinct, 
sporangium- wall thickened with graniilar 
deposits. 6. H. Karstenii 
B. Spores reticulated : — 
Capillitium threads spinose. 7. H. Serpula 
Capillitium threads smooth. 8. H. chrysospora 
1. H.i rubiformis Lister. Plasmodium purple-red, in rotten 
wood. Total height TS to 2'5 mm. Sporangia clavate or sub- 
cyhndrical, stipitate or sessile, combined in clusters or crowded, 
1 to 1"3 mm. high, 0*5 to 0*7 mm. broad, glossy or shining, dark 
red, red-brown, or olive-black ; sporangium-wall of two layers, the 
outer continued into the stalk, the inner enclosing the spores, 
orange-red. Stalks membranous, 0*2 to 1 mm. high, usually 
combined in clusters of from six to twelve, furrowed and rugose, 
red, not enclosing spore-like cells. Capillitium of twisting, spar- 
ingly branched, orange-red threads 5 to 6 //, diam., marked with 
three to five regular spiral bands, beset with numerous scattered 
spines 2 to 5 /x long, rarely nearly smooth, with few pointed free ends. 
Spores pale orange-red, warted, 10 to 11 fx diam. — Hemiarcyria 
rubiformis Rost., Mon., p. 262 ; Cooke, Myx. Brit., p. 67, figs. 201, 
230, 231 ; Blytt, Bidr. K. Norg., Sop. iii. (1892), p. 13 ; Macbride, 
in Bull. Nat. Hist. Iowa, ii., p. 133. Trichia rubiformis Pers., 
in Ebmer, K Mag. Bot., i., p. 88 (1794). Arcyria rubiformis 
Mass., Mon., p. 158. Trichia Neesiana Corda, Ic, i., p. 23. 
a. genuina : sporangia red-brown. 
p. Neesiana Host. : sporangia olive black. 
Plate LXIII., k.—a.. sporangia, x 20 ; Z>. capillitium and spores, •>( 280 ; 
c. capillitium and spore, x 600 (England). 
- Sporangia are occasionally found with a few free elatera pointed 
at each end, in addition to the continuous network of threads of the 
usual type. 
