LECANACTIS. 



253 



Thalamium rimseform, closed, having a proper, longitudinally 

 furrowed, and an accessory thalline, margin. Thallus membrana- 

 ceous. (Name from av\a£, a furrow, in allusion to the structure 

 of the proper margin.) 



1. Aulaco graph a elegans. Thallus subtartareous, or- 

 bicular, granulated or rugose, determinate ; lirellse erumpent, 

 sessile, oblong or linear-elongate, simple, straight or curved ; 

 proper margin thick, tumid, prominent; thalline margin 

 thin, membranaceous. Spores linear-elongate, with a broad, 

 membranaceous border, each containing eleven to thirteen 

 transversely oval, margined cellules; they are among the 

 largest and most handsome spores to be found in the family. 

 (E.B. 1812.) 



Common on various trees, but finest on the holly in vari- 

 ous lowland woods. 



Genus VL LECANACTIS, Eschw. 



Gen. Char. Apothecium lirellate or subdisciform, immersed. 

 Perithecium carbonaceous, entire ; thalamium plane, open, prui- 

 nose, having a proper margin. Thallus crustaceous. (Name 

 from XeKOLvrj, a dish, and Slktlv, a ray, probably from its affinity, 

 in regard to its fructification, to the genus Lecidea.) 



1. Lecanactis lyncea. Thallus tartareous, pulverulent, 



