36 



Species. 



4. S. cavernosa Stiff and hard; very cavernous; 



mammillated, and irregularly 

 porous. 



5. — cariosa Rudely shaped, and irregularly 



lobed ; cavernous, and jagged 

 as if eroded. 



6. — licheyiiformis. ...Rather glomerated, and a little 



branchy; fibres very lax. 



7. — barba Fibres shaggy and rather straight, 



resembling the beard of a goat. 



8. — fasciculata Fibres in fasciculi, terminating in 



pencils at the surface. 



9. — lacera Terminating in jagged, branchy 



lobes. 



10. — Jilamentosa Formed of numerous bundles of 



distinct filaments. 



11. — favosa Surface membranaceous ; nearly 



covered with subangular, irre- 

 gular cells. 



12. — cellulosa Beset with subangular cells; in- 



terstial membranes full of pores. 



13. — septosa With nearly erect lamellae, de- 



cussating and forming irre- 

 gular cells. 



14. — fenestrata With reticulated fibres, in unequal 



and winding divisions. 



15. — crassiloba Encrusting; deeply lobed; thick, 



erect, fiattish, conoidal lobes. 



16. — tabula Flat, oblong, nearly undivided; 



full of pores. 



17. — placenta Obliquely circular; plano-con- 



vex ; rigid ; full of pores ; ra- 

 diated, in grooves, at the edges. 



18. — byssoides Flat; formed of distinct fibres, 



and loosely cancellated. 



