SYNOPSIS. O 



14. Collema Wigg. ThaUus membranacco-lobate, rarely granu- 

 losc ; gonimia moniliform ; cortical layer absent : apothecia leca- 

 norine, with multilocular, rarely simple spores ; spermogoncs witb 

 jointed sterigmata, rarely with simple sterigmata, and straight sper- 

 matia. 



15. Collemodium Nyl. ThaUus variously lobed or subfruticulose ; 

 cortical layer somewhat distinct ; gonimia scattered, partly moni- 

 liform : apothecia lecanorine, rarely biatorine, with variously septate 

 spores ; spermogones with jointed sterigmata and straight spermatia. 



16. Leptogium Gray. Thallus membranaceo-lobato, granulosa, 

 rarely fruticulose ; gonimia usually moniliform ; cortical layer 

 distinct : apothecia lecanorine, with variously divided, rarely simple 

 spores ; spermogones with jointed sterigmata and straight spermatia. 



17. Dendriscocaulon Nyl. ThaUus fruticulose, with soUd axis, 

 branches covered with minute leprarioid lacinJEe, containing goni- 

 mia : frutification unknown. 



18. Collemopsis Nyl. ThaUus granulato-areolate, glaucous-green 

 within ; gonimia submoniUform : apothecia lecanorine or pseudo- 

 pyrenocarpous, with simple spores ; spermogones with simpUsh 

 sterigmata and oblong spermatia. 



Tribe III. PYRENIDIEI Nyl. ThaUus fibrUlose, gonimia moni- 

 Uform ; cortical layer distinct : apothecia pyrenoid. 



19. Pyrenidinm ISTyl. ThaUus steUato-divided, cortical layer 

 ceUular : apothecia innate, with 3-septate spores ; spermogoncs un- 

 known. 



FamUy HI. LICHENACEI Nyl. ThaUus not gelatinous, 

 with a gonidial, rarely gonimic layer ; meduUa more or less dis- 

 tinct. 



Series I. EPICONIOBEI Nyl. Apothecia with the spores at 

 length usuaUy naked and pulverulent on their surface. 



Tribe I. CALICIEI Nyl. ThaUus horizontaUy expanded, some- 

 times none : apothecia stipitate, capituliform or sessUe. 



20. SpMnctrina Fr. ThaUus none proper : apothecia subsessUe, 

 globoso-turbinate, black, with simple blackish spores ; spermogones 

 with simple sterigmata and arcuate spermatia. 



21. Caliciuiu Pers. ThaUus granuloso-pulverulent : apothecia 

 stipitate, globoso-turbinate, black, with simple or 1-septate, brownish- 

 black spores ; spermogones with simplish sterigmata and oblong 

 spermatia. 



22. Stenocybe Nyl. Thallus obsolete : apothecia stipitate, tur- 

 binato-clavate, black, with normaUy 3-septate, blackish spores, not 

 in a mass ; spermogones not rightly known. 



b2 



