306 OUTLINES OF BRITISH FUNGOLOC.Y. 



72. ^THALIUM, Lk. 



Peridium indeterminate, externally covered by a floccosc 

 evanescent bark, cellular within from the confluent interwoven 

 flocci. 



1. septicum, Fr. In woods, on various substances. 



2. vaporarium, Fr. ; Grev. ^.272. In stoves, on bark. 



73. SPUMARIA, P. 



Peridium indeterminate, simple, crustaceous, flocculoso- 

 cellular. Spores surrounded by membranaceous, ascending, 

 often sinuous folds. 



1. alba, DC. ; Grev. t. 267. On living culms of grass, etc. 



74. DIDERMA, P. 



Peridium double ; external, distinct, crustaceous, smooth ; 

 internal delicate, evanescent, attached to the straggling flocci, 

 with or without a columella. 



1. floriforme, P. Syn. p. 165 ; Bull. ^.371. On decayed wood, etc. 



2. urabilicatum, P. I. c; Fl. Ban. 1972. /. 1. On dead bark, etc. 

 8. citrinum, Fr.; Fl. Dan. 1312./. 1. On Sphagnum. 



4. vernicosum, P. Obs. t. 3./. 7; Grev. t. 111. On dead loaves, etc. 



5. spumarioides. Fa-. ; Fl. Dan. 1798. /. 2. On moss, dead leaves, etc. 



6. Trevelyani, Fr. ; Grev. ^.132. On mosses. 



7. Carmichaelianum, B. in Enrjl. Fl. I.e. p.?>^\. On mosses. 



8. nitons, Klotzsch ; Engl. Fl. I. c. On bark. 



9. globosura, Fr.; Grev. ^.122. On dead leaves. 



10. cyanescens, Fr. On dead and living leaves. 



11. deplanatum, Fr. On dead oak-leaves, etc. 



12. contextum, P. Obs. i. p. 89; Ditm. in Sturm, i. t. 39; {no. 109). On 



dead grass, fern, etc. 



