192 ENDOSPORE.E. [ARCYRIA. 



gatherings of any other species of Arcyria; the cup of the sporangium- 

 wall is indeed smooth or nearly so, but the persistent plates which are 

 conspicuous in the var. rosea are papillose and similar to those in the 

 Lyme Regis and Strassburg specimens of A. (Erstedtii from which we 

 are unable to detect a specific difference. 



Hab. On dead wood. Lyme Regis, Dorset (L:B.M.161) ; Sutton, 

 Warwick (L:B.M.161); Germany (Strassb. Herb.); Denmark (K. 893); 

 Norway (L:B.M.161); N. S. Wales (K. 154) ; Philadelphia (L:B.M. 161). 



SPECIES NOT MET WITH IN THE QUOTED COLLECTIONS. 



10. A. affinis Host., Mon., p. 276 (1875). Sporangia cylindric- 

 ovoid, 1 mm. high, stalks 1 inm. high, crowded on the substratum; 

 mass of spores arid capillitium purple-red, or yellowish-red ; net 

 of capillitium free from the cup, consisting of cylindrical threads 

 3'6 /x diarn. in the lower part, 5*4 tt diarn. in the upper part; 

 thickenings as in A. incarnata. 



Hab. On tree trunks, Sweden. 



This description applies to the bright-coloured forms of A. incarnata. 



11. A. similis Racib., in Rozpr. Mat. Przyr. Ak. Krak., xii., p. 81 

 (1884). Sporangia shortly stipitate, cherry-coloured. Capillitium 

 free from the cup, consisting of thick-walled, cylindrical or slightly 

 compressed threads 4'2 to 5'8 /x diam., marked everywhere with 

 warts and raised bands : bands usually half-ringshaped, arranged 

 not in spirals as in A . adnata, but quite irregularly, or with a few 

 placed one over the other as in A. ferruginea, or in broken, 

 irregular spirals ; spores 7'5 to 8 - 3 p, diam., almost colourless, 

 thin-walled, distinctly verruculose. 



Hab. Near Cracow, Poland. 



This description suggests a form of A. incarnata, in which species 

 the markings on the capillitium are subject to great variation in shape 

 and arrangement. 



12. A. irregularis Racib., I.e., p. 83 (1884). Sporangia flesh- 

 coloured, stipitate; stalks 0'5 mm. high, filled with colourless 

 vesicles ; cup hemispherical, the wall verruculose ; capillitium 

 forming an irregular network of flattened threads with undulate 

 margins, 4*5 to 9'1 /x wide, 2'5 to 4'5 /x thick, densely beset 

 throughout with irregular conical prominences, 0'8 to 1'5 /x broad, 

 and usually elongated; spores 7 to 7*5 /x diam., with a firm, 

 almost colourless wall. 



Hab. On dead chestnut. Near Cracow, Poland. 

 This description suggests also a form of A. incarnata. 



13. A. inermis Racib., I.e., p. 82 (1884). Sporangia stalked, 

 brick-red; the stalk filled with vesicles and capillitium threads; 

 net of capillitium consisting of cylindrico-complanate threads, 

 4'2 to 10*8 /x wide, marked with thickenings forming a reticulation 

 with meshes 1*6 to 2 /x long, and almost equally broad. Spores 

 9'9 to 1O8 /x diam., the wall firm, reddish, distinctly warted. 



