STICTA. 



181 



vegetations amid the moisture-laden mists which almost 

 'constantly envelope the summits of our higher Highland 

 mountains. 



Nat. Ord. VI. PAEMELIACEJB. 



Tarn. Char. Tkallus foliaceous, laciniate or squamulose, pro- 

 strate or ascending, — below of different colour. Apothecium scu- 

 tellate, normally affixed by a central point. Thalamium concave 

 or flat, sometimes tumid, varying in colour. 



Genus I. STICTA, Schreb. 



Gen. Char. Th alius laciniate-lobate, expanded from a centre ; 

 below tomentose, and marked by naked gibbi (discoloured spots) 

 or by cyphella. Apotliecia sessile, marginal or superficial, some- 

 what obliquely affixed : thalamium at first closed or nucleiform, 

 becoming elevated and explanate ; colour usually similar to that 

 of the thallus or brownish.* (Name probably from gttlktos, 

 spotted, in allusion to the gibbi and cyphellse.) 



Thallus below gibherose : gibbi naked. 

 1. Sticta pulmonaria [pulmo, the lungs). Thallus cori- 



* De Notaris, " Osservazioni sul Genere Sticta" in the " Memorie della 

 Reale Accad. delle Scienze di Torino," 2nd series, vol. xii., and in " Giorn. 

 Bot. Ital." Ann. ii. : Delize, L'Hist, du Genre Sticta, 1822. 



