39 



III. Pediculated masses; flat, flabelliform; simple or 

 lobated. 



Species. 



44. S. plancella Truncated oval form, flat; not 



thick; curved on one of its 

 edges ; tissue lightly encrusted, 

 and finely porous. 



45. pala Spatuliform, openings round, on 



its upper margin. 



46. flabelliformis . . .Fan - formed ; elegantly reticu- 



lated, with superficial undu- 

 lating stripes, decussating on 

 the disk. 



47. pluma Finely fibrous; spread fan-like. 



48. carduus Open, like a fan ; with lamellated 



wrinkles on both sides, and 

 echinated with spines. 



49. panned Flabelliform; with a cloth-like 



texture. 



50. fissurata Fan -formed ; more or less lobated, 



and covered with small irre- 

 gular crevices. 



51. cancellaria Low, flabelliform, and compres- 



sed; ramifications coalescent, 

 disposed in a trellised form, and 

 bristled on the edges. 



52. lyrata Erect, compressed, fan -formed 



lobes, with connected tubes; 

 upper margin rounded and set 

 with foramina. 



53. deltoidea Erect; truncated in the upper 



part; (frequently encrusted 

 with vermiculae on both sides.) 



