NEW LICHENS. 159 
Lecanora, Ach. 
1. L. vigilans, Tayl.; crusta tartarea, tenui, rugulosa, alba, 
nigro-limitata; gemmis minutissime granulatis ; apotheciis 
sparsis, majoribus, convexis, disco rufescenti, pruinoso, in- 
tus fusco-albidis, margine incrassato integerrimo, subun- 
dulato, rufo-cinereo. 
Has. On bark, Mauritius. Casapi, Peru; Mathews, Hook. 
herb.—Patches 1-2 inches wide; thallus thin, assuming 
the irregular surface of the bark on which it grows. 
The buds are minute granules, sometimes tipped with 
brown. Apothecia a little larger than turnep-seed. A 
vertical section shews a thin dark layer interposed between 
the lamina and white thallodal matter. The black limit to 
the crust, the entire border of the apothecia, and the 
minute granular buds distinguish this species from L. sub- 
J'usca, Ach. 
2. L. millegrana, Tayl.; thalli tartarei granulis confertis, — 
planiusculis, subconfluentibus, albido-olivaceis, madore — — 
virescentibus, minutissimis, inzequalibus ; apotheciis minu- mu 
tis, convexis, aggregatis, disco rufescenti, pine pus Du. 
albidis, margine pallide fusco, integerrimo. — n 
Has. No. 589. On trees; Buenos Ayres ; Tweedie, ‘Hook. | 
: ‘herb. — Patch 1-2 inches wide, without any 
border, obscurely pale olive-green, 
. Scarcely lobate, Apothecia when moistened dark brownish- - 
. red, interiorly very pale brown. This differs from a moun- 
tain: variety of L. s Ach. common in Ireland, by 
| the entire border of the pes and the ae tumid 
ee of the thallus. da 
