PAKMELIACE^. 



[ 580 ] 



PATELLINA. 



PARMELIA'CE^.— A family of open- 

 fruited Lichenaceous Lichens, beaiing ses- 

 sile shields, tlie borders of which are formed 

 by the surface of the th alius. This family 

 corresponds nearl}' to the series Eamalodei, 

 Phyllodei, and Placodei, of the family Li- 

 chenacei in Leigh ton's B}'it. Lich. Flora. 



British Genera. 



* Apotheeia atjirst veiled, thallus horizontal : 

 Peltigeri. 



Peltif/era. Thallus foliaceous, leathery 

 or membranons, spreading, lobed, with 

 woolly veins beneath. Apotheeia somewhat 

 circular, adnate on the upper side of the 

 lobules of the thallus, with a border fomied 

 by this. 



Kephroma. Thallus foliaceous, leathery 

 or membranous, spreading, lobed, naked or 

 hairy beneath. Apotheeia circular or reni- 

 form, adnate on the underside of the lobules 

 of the thallus, vnih a border formed by the 

 latter. 



Solorina. Thallus leathery, membrana- 

 ceous, veined or fibrillose below. Apo- 

 theciwn suborbicidar, affixed to the upper 

 sm-face of the central lobes of the thallus ; 

 veil finall}' forming an evanescent margin. 



^"^ Apotheeia at first closed, thallus horizontal : 

 Euparuieliacei. 



Sticta. Thallus fohaceous, leathery-car- 

 tilaginous, spreading, lobed, free and downy 

 beneath, with little cavities or hollow spots, 

 often containing a powdery substance. Apo- 

 theeia beneath formed of the thallus, to 

 which thej'^ are appressed and fixed by a 

 central point, the disk coloured, flat, sur- 

 rounded by an elevated thalline border. 



Parmelid. Thallus foliaceous, membranous 

 or leathery, spreading, lobed and stellated 

 or laciniated, more or less fibrous beneath. 

 Apotheeia circular, formed by the thallus, 

 fixed by a central point, disk concave, 

 coloured, with an infiexed margin from 

 the thallus. 



Urceolaria. Thallus luiiform, crusta- 

 ceous. Apotheeia urceolate, somewhat im- 

 mersed, the thalline border somewhat di- 

 stinct. 



Lecanora. Thallus crustaceous, spread- 

 ing, flat, adnate and uniform. Apotheeia 

 circular, thick, sessile and adnate; disk 

 plano-convex, the border thickish, formed 

 of the crust, and of the same colour. 



Physcia. Thallus caililaginous, branched 

 and laciniated, the segments free, generally 

 grooved beneath, the margins frequently 



ciliated. Apotheeia circular, peltate, foi-med 

 of the thallus, the disk coloured and sur- 

 rounded by an inflexed thalline margin. 



*** Apotheeia open fro7n the frst, thallus 

 mosfl)/ centripetal, veHieal or sarmen- 

 tose, without any hypothallus : L^snei. 



Cetraria. Thallus foliaceous, cartila- 

 gineo-membranous, ascending or spreading, 

 lobed and laciniated, smooth and naked on 

 both sides. Apotheeia circular, obliquely 

 adnate to the margin of the thallus, the 

 lower portion being free (from the thallus) : 

 disk coloured, plano-concave, with an in- 

 flexed thalline border. 



Roecella. Thallus cartilaginous, leathery, 

 rounded or flat, branched or laciniate. 

 Apotheeia circular, adnate to the thaUus, 

 disk coloured, plano-convex, with a thalline 

 border, at length thickened and elevated, 

 and covering a black powder concealed 

 within the substance of the thallus. 



Ramalina. Thallus cartilaginous, gene- 

 rally branched and laciniated, somewhat 

 shrubby, generally bearing powdery wai-ts, 

 cottony and compact within. Apotheeia 

 circxilar, shield-shaped, stalked and peltate, 

 flat, bordered, entirely formed of the sub- 

 stance of the thallus, and mostly of the 

 same colour. 



Cornicularia. Thallus cartilaginous, 

 branched, subcylindrical, fistulose, or nearly 

 sohd and cottony within. Apotheeia cir- 

 cular, tenniual, "obliquely peltate, entirely 

 formed of the substance of the thallus, at 

 length convex, more or less bordered and 

 often toothed. 



Evcrnia. Thallus somewhat crustaceous, 

 branched and laciniated, angled or com- 

 pressed, cottony within. Apotheeia circular, 

 shield-shaped, sessile, with the disk concave, 

 coloured, and an inflexed border formed by 

 the thallus. 



Usnea. Thallus somewhat crustaceous, 

 rounded branched, generally pendulous, 

 with a central thread. Apotheeia circulai-, 

 terminal on processes of the thallus, peltate, 

 nearly of the same colour, mostly without a 

 raised border, but ciliated at the margins. 

 BiBL. See the genera. 

 PASTE, Eels ix. See AxGUiLLrLA. 

 PATELLI'NA, Will.— A genus of Hya- 

 line Foraminifera, of the Ilotaline family. 



Trochoid, formed of a low cone of sub- 

 spiral, seraiannular, and annular chambers, 

 divided into chamberlets. Sometimes in- 

 crusted with small cells externally, and 



