Didymium. 225 



Var. costcdum. 



Sporangia covered uniformly with minute particles of lime, 

 not hcGoming broken u^ into large, distinct 2>tttchcs ; stem white, 

 variable in length, expanding at the base into a small hypo- 

 tliallus with prominent radiating ridges. Stem sometimes very 

 short, sunk in the umbilicus or entirely absent. 



Didynvium squaviulosum, /3. leucoims, y. costatum, Rost., Mon., 

 p. 159; Cooke, Myx. Brit., p. 33; Sacc, Syll., no. 1301. 



Exsicc, — Rab,, Fung. Eur., 367 (as Didymitiiii jJi'uecox, De 

 Bary) ; Fuckel, Fung, llhen., 2690 (as Didymium squamulosum 

 y. costatum) ; Rab.-Wint., Fung. Eur., 2675 (as Didymium Nca- 

 polifanum, Ces.). 



On leaves, wood, &c. 



Distinguished from the type by the white crust of the pileus 

 not becoming broken up into patches, and by the markedly 

 costate hypothallus. Somewhat i-esembling Didymium. dqnrs- 

 sum, Fr., which however is readily distinguished by the much 

 larger and more coarsely warted spores. 



Britain (Epping Forest, Chiselhurst, Kew, Carlisle) ; France ; 

 Germany; Austria. 



(Rostafinski's Synonyms.) 



Bcticularia hemispherica, Bull., p. 93 (1791). 

 Diderma sqtiamulosum, A. and S., t. 4, f 5 (1805). 

 Didymium glohosum, v. stipitatiim, Schwarz., Ac. Holm., p. 



114 (1815). 

 Zicca stipitata, D. C, Fl. Fr., No. 670 (1815). 

 Tuhulina 2)ediccUaf.a, Poir., Ency., v., p. 373. 

 Cionium fariimceum, Spr., Syst., iv., 528 (1827). 

 Didymium herhantm, Fr., S. M., iii., 120 (1829). 

 Didymium kucojms, Fr., S. M., iii., 121 (1829); Cooke, Hdbk., 



No. 1127. 

 Didymium costatum, Fr., S. M., iii., 118 (1829). 

 Didymium Ikcoidcs, Duby, Bot. Gall., ii., 864- (1830). 

 Duhjmiitmfilamndosnm, Wallr., Fl. Germ., No. 2187 (1833). 



Q 



