184 
ENDOSPOREiE. 
[arcyria. 
KEY TO THE SPECIES OF ARCYRIA. 
A. Spores 9 to 11 /a diam., sporangia orange-red or buff: 
Sporangia ovoid, wall reticulated. 1. A. /er7'uginea 
Sporangia clavate, wall papillose. 2. A. versicolor 
B. Spores 6 to 8 diam. : — 
A. Capillitium attached to the cup — 
Capillitium closely spinulose, grey, or yellowish -grey. 
3. A. albida 
Capillitium marked with cogs and half -rings ; sporangia 
red, ovoid, or subcylindrical. 4, A. punicea 
Capillitium marked with transverse bands and minute 
spines; sporangia flesh-coloured, turbinate, small. 
5. A. insignis 
B. Capillitium free from /the cup — 
a. Network of capillitium expanding, not di-ooping — 
Capillitium marked with cogs and spines. 
6. A. incarnafa 
Capillitium marked with cogs, spines, and three to 
four indistinct spiral bands in addition. 
7. A. sti2)ata 
h. Network of capillitium much elongated, drooping — 
Sporangia buff ; wall evanescent above. 
8. A. flava, 
Sporangia red ; wall persistent above in shield-Hke 
fragments. 9. A. (Erstedtii 
1. A. ferruginea Sauter, in Flora, xxiv., p. 316 (1841). Plas- 
modium rose-red, in rotten wood. Total height 1 to 2 mm. 
Sporangia ovoid, stipitate, crowded, 0*7 to 1*3 mm. high, 0"5 to 
1 mm. broad, orange-red, or more rarely pale ochraceous; cup of 
sporangium even, shining, funnel-shaped, or at length nearly 
flat, marked with round-meshed reticulations on the inner side. 
Stalk cylindrical, 0*3 to 0*8 mm. long, 0*05 to 0*15 mm. thick, 
red, rarely white, arising from a well-developed membranous 
hypothallus ; filled with spore-like cells. Capillitium an elastic 
network of freely branching yellow-brown threads, 5 to 8 /a diam., 
diminishing to 2 to 3 /a diam. towards the base, triangular or 
oval in section, thickened on one side with transverse bars or 
reticulations, on the other two sides marked with a broken re- 
ticulation or with warts, often spinulose throughout ; a few 
sparingly branched slender threads penetrate the tube of the 
stalk without attachments to the cup ; free ends with rounded or 
pointed tips are not unfrequent, but often wanting. Spores pale 
red or ochraceous, faintly and closely warted, 8 to W fx diam. — 
Post., Mon., p. 279 ; Cooke, Myx. Brit., p. 73, fig. 194 ; Blytt, Bidr. 
