182 LECANORA. 



rounded peltate clumps) ; pale-straw-coloured ; apothecia mid- 

 dling to ample, sub-terminal ; disk from pale-yellowish passing 

 into tawny-red, margin crenate. Spores ovoid - ellipsoid, - ( 



mic. Lick. Calif, p. 20. 



Sandstones of the Pacific Coast ; Oakland hills, and S. Bruno 



(Bolander), Tuckerman I c. 1866. L. Bolanderi offers effuse 



conditions; as L. thamnitis, first observed only in such state, 

 passes finally into peltate ones, like the other; but the two 

 lichens, in large sets of specimens, are, so far, distinguishable. 

 They are placed however here, with the next following one, 

 under the same number, as probably only forms of one species. 



L. rubina, of the next division, which exhibits monophyl- 



lous, and peltate, together with complicate, almost branched 

 states, illustrates the transition of Squamaria into Cladodium ; 

 and sufficiently perhaps explains the rather surprising diversity 

 of the latter group. 



l(c). L. pliryganitis, Tuck.; thallus ochroleucous ; stout, 

 rimulose-rugulose, forming rounded patches, made up at the 

 centre of short, erect, obtuse branches, which are elongated, and 

 decumbent at the circumference ; apothecia middling to ample, 

 lateral, sub-sessile ; disk pale-brick-coloured, margin flexuously 

 lobed. Spores oblong- ellipsoid, ^^ mic. Lich. Calif, p. 19. 



Coast standstones (" usually in depressions, forming in them 

 round patches") from Mission Dolores to the Ocean (Bolander}, 

 Tuckerman I. c. 1866. 



** Squamaria. Thallus lobed ; sub-foliaceous. Spores 

 simple. 



2. L. lentigera (Web.) Ach. ; thallus crustaceous-foliaceous, 

 thickish, radious; greenish- white, more or less white -pruinose ; 

 at the circumference lobed, sinuately cut, and crenate, but 

 broken at the centre into areole-like divisions; [apothecia of 

 middling size, adnate ; the disk reddish-buff-coloured, the thin 

 thalline margin persistent. Spores oblong- ellipsoid, c. ^- mic.] 



Parmelia, Fr. L. E. p. 103. Lecanora, Nyl. Scand. p. 130. 



Parmelia crassa, a, Schcer. Spicil. p. 431. 



Calcareous earth, Bad Lands of Judith, Nebraska (infertile), 



Hayden. Referable here rather than to the closely allied L. 



crassa ; which has not occurred with us. 



3. L. gelida (L.) Ach. ; thallus crustaceous, adnate, chinky, 



