4 BRITISH LICHENS : 
23. Coniocybe 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. SPHAROPHOREI Ny). Thallus fruticulose, branched: 
apothecia terminal, innate, closed, at length open and variously 
dehiscent. 
25. Spherophorus Pers. Thallus cespitose : 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 IIT. BHOMYCETEI Nyl. Thallus horizontally expanded: 
apothecia substipitate. : 
26. Gomphillus Nyl. Thallus gelatinoso-conglutinate : apothe- 
cia stipitate, clavato-capitate with filiform multiseptate spores ; sper- 
mogones with simple sterigmata and cylindrical spermatia. 
27. Beomyces 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 IV. 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. Thallus cespitose, podetiiform, 
solid: apothecia terminal or lateral, lecideine or rarely lecanorine. 
29. Stereocaulon Schreb. Thallus bearing cephalodia; podetia 
covered with fragile granules: apothecia brownish or blackish, with 
3-9-septate spores; spermogones with simple sterigmata and sub- 
bacillar, straight or slightly curved spermatia. 
30. Leprocaulon Nyl. ‘Thallus not bearing cephalodia, with 
pseudo-podetia, which are more or less leprose: apothecia and 
spermogones unknown. 
