. The Bryologist. Bryology; Bryology -- Periodicals. —45 —. J^ *ll# ARIA , Tuckm. (Fig. 6.) Thallus foliaceous. rather rigid, leaf-like and much wrinkled. It is dark brown, rather paler beneath, with no fibrils. The lobes are round and slightly notched. The apothecia are medium, marginal, disk a little darker brown than the thallus, and the edges are rough. C. plaiyphylla resembles some of the vStictas in appearance. Cetraria (Ach.) Th. a common one in the Northern and Middle States, and is found in the moun- tains of the Southern States. It grows on trees a
. The Bryologist. Bryology; Bryology -- Periodicals. —45 —. J^ *ll# ARIA , Tuckm. (Fig. 6.) Thallus foliaceous. rather rigid, leaf-like and much wrinkled. It is dark brown, rather paler beneath, with no fibrils. The lobes are round and slightly notched. The apothecia are medium, marginal, disk a little darker brown than the thallus, and the edges are rough. C. plaiyphylla resembles some of the vStictas in appearance. Cetraria (Ach.) Th. a common one in the Northern and Middle States, and is found in the moun- tains of the Southern States. It grows on trees and dead wood, especially on coniferous trees, and adheres closely to the substratum. The thallus is folia- ceous. with deep clefts, and is usually covered with isidiod granules which at the center sometmies form a thick crust. It is straw color, in some speci- mens is greener than in others. Beneath it is paler and much wrinkled with brown fibrils. Apothecia are found on the margin of the thallus; they are a pale chestnut color, with granules on the margin. Fig. 6. C. platyphylla x I. is not a conspicuous l.,ichen, but is SCAPANIA EVANSII N. SP. By N. Bryhn. In appearance not unlike the larger forms of Scapania Scop. {Sc. umbrosa Dum.) Dioicus, the male plants mixed with the female, about lo mm. high, with the leaves to mm. wide, caespitose, the tufts quite spread out, not very dense, below dark green, above yellowish- or ochraceous-green, very closely set with leaves. Stem rigid, slightly and distantly branched, ascending or erect, on the under side densely covered with long hyaline radicles, dark colored, below blackish, o 2 mm. thick, in cross-section round-oval, the peripheral cells with pigmented walls in one or two layers. Leaves pellucid, but firm, quite densely imbricated, equal or subequal, spreading at a right angle with the stem, folded and sharply keeled, two- thirds to three-fourths divided into two unequal lobes; the keel of the leaves distin
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