248 A Monograph of the Afj/avgastres. 



combine the two, as the present species appears to differ in the 

 absence of a hypothallus. 



Didymium Weinmanni, Fr. 



Sporangia turbinate, very fragile, covered with grey meal, 

 stem short, with a yellow tinge, columella absent ; spores 

 blackish. 



Didymium Weinmanni, Fr., S. M., iii., p. 121 ; Sacc, Syll., 

 n. 1331. 



On living herbaceous stems. Russia. 



Minute, closely gregarious, and often arranged in lines ; stem 

 equal, expanded at the base ; sporangia membranaceous, oblong 

 or pyriform, covered with grey meal. (Fr.) 



Didymium humile, Hanzl. 



Sporangia applanate, grey, pruinose, apex slightly, below 

 deeply umbilicate ; stem cylindrical, brown, short; capillitium 

 of simple, tortuous, smooth, brown threads ; spores brown, 6 — 7 /a 

 diameter. 



Hanzl. Ein neue Myx. types, in Just. Bot. Jahresb., 1872, 

 p. 155 ; Sacc, Syll., 1324. 



Hungary, 



Didymium fulvipes, Fr. 



Stem compressed, sulcate, foxy-vermilion ; sporangium globose, 

 delicately villose, grey. 



Didymimn ftdvi2KS, Fr., Stirp. Femsj., p. 83 ; Fr., Gast., p. 24 ; 

 Sacc, Syll, 1323. 



Sweden. 



Stem and hypothallus resembling those of Hemiarcyria ruhi- 

 formis, very unequal, compressed, subconfluent, longitudinally 

 sulcato-rugose, 2 mm. and more in length ; sporangium globose, 

 or slightly depressed, obtuse, often confluent, with a very 

 delicate grey villose covering ; columella absent ; threads brown. 

 (Fr.^) 



The villose covering of the sporangium alluded to by Fries 

 would in all probability consist of a very subtle coating of a 

 pulverulent nature. 



