NEW LICHENS. 183 
surface, by the upper not being lacunose, by the want of 
granulate buds on the thallus, and by the apothecia 
remaining very concave even in old age. 
16. S. calithamnia, Tayl.; thallo suberecto, substipitato, 
plano, glaucescenti, madore fusco, subtus rufescenti, sub- 
villoso, sublacunoso, ramosissimo, ramis sinuato-laeimu- 
latis; cyphellis nullis. ad 
Has. On trees and stones; Juan Fernandez; Hook. herb— 
In flattish tufts. Thallus about one inch long, much sub- 
divided, the sinuses roundish. Allied to S. filicina, Ach. ; 
our plant, however, is shorter, more subdivided, the ulti- 
mate laciniæ are rounder, the inferior surface is more 
villose and presents no cyphellæ. gius din 
17. S. bicolor, Tayl; thallo orbiculato, levigato, inciso- 
lobato, lobis sublaciniatis, laciniis brevibus, subangulatis, 
Tufescenti-cinereo, subtus fuscescenti ; cyphellis | albidis, 
Planis, margine elevatis; apotheciis marginalibus, disco 
rufo, margine integerrimo, subtus floccosis. 
Han. Organ Mountains; Gardner, G. J. Lyows herb.— 
Thallus 4inches wide, lobes scarcely one quarter of an 
inch broad, the central parts of an ash-grey, the extreme - 
9f a chestnut brown, but little deepened by moisture. 
Thethick dark grey scabrous pubescence of the inferior 
Surface of the thallus reappears on the backs of the apo- 
thecia, The smooth surface of the thallus and the crowded 
_ Marginal sessile apothecia readily distinguish this species 
ftom B. sylvatica, Ach. ———— P aes 
PELTIDEA, Ach. 
