4. BEITI8H LICHENS : 



23. Comocybe Ach. Thallus pulverulent : apothecia stipitate, 

 globoso-pulverulent, yellowish, with simple, colourless or yellowish 

 spores : spermogones with simplish sterigmata and cylindrical, 

 straight spermatia. 



24. Trachylia Fr. Thallus granulose : apothecia cupuliform, 

 sessile, black, with 1-septate, blackish spores; spermogones with 

 simplish sterigmata and oblong or ellipsoid spermatia. 



Tribe II. SPKffiEOPHOREI Nyl. ThaUus fruticulose, branched : 

 apothecia terminal, innate, closed, at length open and variously 

 dehiscent. 



25. Sphaerophoms Pers. Thallus caespitose : apothecia globose, 

 with spherical violet-black spores ; spermogones with simplish short 

 sterigmata and oblong spermatia. 



Series II. CLADODEI Nyl. Apothecia terminal on podetia, 

 rarely sessile, biatorine, rarely lecanorine. 



Tribe III. BiEOMYCETEI IS'yl. Thallus horizontally expanded: 

 apothecia substipitate. 



26. Gomphillus Xyl. ThaUus gelatinoso-conglutinate : apothe- 

 cia stipitate, clavato-capitate with filiform multiseptate spores ; sper- 

 mogones with simple sterigmata and cylindrical spermatia. 



27. BsBOmyces Pers. Thallus crustaceo-granulose or subsqua- 

 mulose : apothecia stipitate or sessile, biatorine, with simple or 

 1-3-septate spores ; spermogones with jointed sterigmata and straight 

 spermatia. 



Tribe lY. PILOPHOREI Nyl. Thallus verrucoso-granulate with 

 rigid podetia : apothecia cephalodine on the podetia, with paraphyses 

 prolonged into the hypothecium. 



28. Pilophorus Fr. fil. Thallus bearing cephalodia : apothecia 

 subglobose, black, with simple spores ; spermogones with simplish 

 sterigmata and curved or straight spermatia. 



Tribe V. STEREOCAULEI Nyl. ThaUus csespitose, podetiiform, 

 soUd : apothecia terminal or lateral, lecideine or rarely lecanorine. 



29. Stereocaulon Schreb. Thallus bearing cephalodia; podetia 

 covered with fragile granules : apothecia brownish or blackish, with 

 3-*J-septate spores ; spermogones with simple sterigmata and sub- 

 bacUlar, straight or slightly curved spermatia. 



30. Leprocaulon Nyl. Thallus not bearing cephalodia, with 

 pseudo-podctia, which are more or less leprose : apothecia and 

 spermogones unknown. 



