102 ^EPHROMA. 



Among mosses on rocks, and on trunks. Coast of California, 

 Menzies in Ach. Meth. 1803. Coast of Oregon, Hall. 



f f Thallus without cypliels, but marked beneath with naked, 

 white spots. 



16. S. Hallii, Tuckerm.; thallus cartilagineous-coriaceous, 

 wide-lobed, reticulate-lacunose, delicately rimulose-granulate, 

 and at length more or less villous, and beset now with lead-col- 

 oured soredia, ashy-glaucescent ; beneath ribbed, pale-villous 

 between naked whitish spots ; lobes rounded, very entire ; apo- 

 thecia scattered, smallish to middling-sized, biatoroid, the exci- 

 ple externally pilose ; disk reddish-brown ; the paler margin 



entire. Spores cymbiform, bilocular, brown, ^^ mic. Obs. 



Lich. 4, I c. p. 168. 



On trunks, Oregon, E. Hall; to whom the lichen is gratefully 

 inscribed. 



17. S. scrobiculata (Scop.) Ach. ; thallus ample, sub-orbicu- 

 lar, coriaceous, smooth, pitted, beset more or less with grey sore- 

 dia; yellowish-green; beneath becoming densely dark-villous 

 between naked, pale spots ; lobes rounded, sub-crenate ; [apo- 

 thecia, in European specimens, scattered, smallish ; disk red- 

 brown; margin entire. Spores long- fusiform, 4-8-locular, at 



length colourless, ^ mic.] Ach. L. U. p. 353. Tuck. exs. n. 



67. Nyl. Syn. I, p. 353. 



Rocks among mosses; and on trunks; not seen fertile. New- 

 foundland, De la Pylaie, 1826. New England, not rare. Oregon, 

 Hall. British Columbia, Lyall; Macoun. 



XV. NEPHROMA, Ach. 



Apothecia reniform ; innate in the under side of some- 

 what extended lobules; the entire margin disappearing. 

 Spores sub-fusiform, quadrilocular, fuscescent. Spermatia 

 oblong, narrowed a little at the middle ; on multi-articulate 

 sterigmas. Thallus frondose, more or less villous beneath 

 (except in n. 3) but not veiny. Gouimous layer constituted 



now (sect. *) of gonidia, and now (sect. * *) of gonimia. 



Structurally close to Slicta, Nephroma is a well-distinguished, 

 small group, having its main development in the cooler 



