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. licheniformis. ...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. filamentosa 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, flattish, 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. 



