. The Bryologist. Mosses; Liverworts; Lichens; Botany; Bryology. —22 — stratum but when damp is easily removed. It is found in the Eastern and Southern States, but is not common in the West, Physcia HYPOLEUCA (MuHL.) TucKM. Plate III. 2.) Thallus large and smooth, light gray-brown, the lobes rather flat with crenate margins, which are sometimes powdery. Beneath the thallus is either white or light brown, densely covered with tufts of black bristle-like fibrils, with which it adheres •closely to the substratum. The apothecia are rather large, crowded at the centre, cup-shaped, the disk black wi
. The Bryologist. Mosses; Liverworts; Lichens; Botany; Bryology. —22 — stratum but when damp is easily removed. It is found in the Eastern and Southern States, but is not common in the West, Physcia HYPOLEUCA (MuHL.) TucKM. Plate III. 2.) Thallus large and smooth, light gray-brown, the lobes rather flat with crenate margins, which are sometimes powdery. Beneath the thallus is either white or light brown, densely covered with tufts of black bristle-like fibrils, with which it adheres •closely to the substratum. The apothecia are rather large, crowded at the centre, cup-shaped, the disk black with crenulate folded over margin. P. kypoleuca is usually found on trees, and oftener in the South than at the North. Physcia coMosA (EscHW.) Nyl. (Plate III. i.) This very pretty lichen is found throughout the Southern States. The thallus is erect and smooth, and the narrow lobes are coveVed with grayish white fibrils. The apothecia, which are large, are on the ends of the lobes, the disk is blue-gray or prui- nose, surrounded by a thin white border from which extends white cilia. Underneath, the lobes of the thallus are convex, pale gray, thickly covered with long white fibrils. It^adheres lightly to the trees on which it grows. After a rain large specimens are often found on the ground. Physcia leucomela (L.) Michx. (Fig. I.) Thallus ascendant and elong- ated, smooth with long ribbon - like lobes, which become much intertangled and are irregularly divided. Beneath, these lobes are very white, and the margins are covered with strong black fibrils. The edges are rolled over giv- Fig. I. Physcia leucomela. ing the thallus a channeled appearance. While much like P. comosa it can readily be distinguished from it by the color of the fibrils; in P. comosa they are light gray or white, in P. leucoi?tela they are dark brown or black. Apothecia, which are very abundant in P. comosa, are rare in P. leucomela. They are of medium size, pedicellate, the disk almost white, the border
Size: 2092px × 1195px
Photo credit: © Library Book Collection / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdecade1890, booksubjectbotany, booksubjectli
