Arcf/ri'f. 159 



and sessile on a hypotliallus, rarely an irregular plasmodiocarp, 

 hrown or almost black, polislied and with a metallic lustre or 

 opaque ; mass of capillitium and spores orangc-lroicn ; threads 

 of capillitium orange-brown, 8 — 9 /u thick, combined into a 

 dense elastic net, which at maturity elongates considerably, 

 carrying the apical portion of the sporangium at its apex, 

 where it remains in the form of a cap, free tips numerous, 

 usually terminated by from one to three short, smooth spines, 

 rarely obtuse, spirals rather distant, furnished with numeroiis 

 slender sphies ; spores globose, very minutely verruculose, 10 — 12 /x 

 diameter. 



a. genuina; sporangia cylindrico-turbinate, dark-brown, 

 opaque, or with a steel lustre, seated on a common fasciculate 

 stem. 



;8. sessilis ; sporangia sessile, cylindrical or sub-angular from 

 mutual pressure. 



y. plasmodiocarpa ; irregular, attached by a broad base to a 

 hypothallus. 



Hemiarcyria ruUformis, Rost., Moo., p. 262; figs. 201, 230, 

 231; Cooke, Myx. Brit., figs. 201, 230, 231 ; Schroeter, p. 114; 

 Sacc, Syll., vii., n. 1512; Raunk., Myx. Dan., p. 63, t. 3, f. 15, 

 t. 4, f. 6 ; Mass., Rev. Trich., p. 353, fig. 31 (in part). 



Exsicc.—Roxun., Fung. Gall, 1686 ; Fckl, Fung. Rhen., 1438 

 (as Trichia ruhiformis) \ Cooke, Fung. Brit., 612 (as Trichia 

 Neesiana) ; Jack, Leiner u. Sitz. Krypt. Bad., 421 (as Trichia 

 ruhiformis) ; Sacc, Myc. Ven., 962 (as Trichia ^jyj-^/brwiis) ; 

 Hemiarcyria Ellisii, Mass., Rev. Trich., p. 354, f. 30; Karst., 

 Fung. Fenn., 700. 



A widespread and very beautiful species, characterized by the 

 cylindrical or obovate-oblong, brown, fasciculate sporangia, fre- 

 quently exhibiting metallic tints, and the dense orange-brown 

 capillitium of spinulose threads. The spores vary in marking 

 when magnified 1200 diameters from being almost perfectly 

 smooth, to minutely but distinctly warted. 



On rotten wood, moss, &c. Britain (Apetliorpe, Weybridge, 

 Twycross, Birmingham, Bulmer, N. Yorks ; Orton Wood, 

 Leicester; Wothorpe, Scarboro', Carlisle); France; Germany; 



