﻿47 



(Opegrapha.) 



polymorpha, Tuckerm. (Jrthonia, Ach.) Trunks.* 

 Pertusaria. 



pertusa, Fr. a. Trunks. 



faginea, Fr. Trunks. 

 Verrucaria. 



elaeochroa, Tuckerm. Limestone rocks. 



nitida, Schrad. Trunks. 



subelliptica, Tuckerm.^ 



epidermidis, Fr. a. Trunks.^ 



Order 113 — COLLEMACEiE. 



COLLEMA. 



fasciculare, Ach. Trunks, among mosses. 

 Leptogium. 



lacerum, Fr. Limestone rocks ; fertile, 

 corlicola, Tuckerm.* 



' Nearest to the variety maculans, Ach. This is probably the Arthonia poly- 

 morpha of Muhlenberg's Catalogue, and does not seem tome to differ materially 

 from the tropical lichen. It is common at Goat Island, Niagara Falls. Is it 

 not near to Lecanadis lyncea? 



^ Vekhucabia subelliptica: Crusta hypophloeode ; peritheciis subellip- 

 ticis integris obtectis demum emersis, ostiolis papillatis papilla prominula vel 

 rimosis, nucleo nigrescente. Trunks of honey-locust. Distinguished by its 

 generally subelliptical perithecia, which are more constantly and somewhat 

 more prominently papiljated than those of the last species, and are marked 

 very commonly with a furrow which at length gapes open. The perithecia 

 are also smaller than in the common states of V. nitida. 



' Some of the specimens appear to possess an evident thallus. Base of the 

 perithecia patent; nucleus white, globose. Beside this, there occurs a state 

 with larger, applanate depressed perithecia, on a whitish crust, vfhich may be 

 distinct. There is also a Verucarioid plant with very small, often somewhat 

 aggregated, hemispherical apothecia which resembles some states of V. punc- 

 tiformis. 



4 Leptogium cohticola: Thallo foliaceo membranaceo tenero submono- 

 phylio, orbiculari utrinque glabro papuloso, minutissime ruguloso e glauco- 

 viridi-plumbeo, lobis adscendentibus rotundatis integerrimis flexuosis demum 

 et rugosoplicatis ; apotheciis majuscuHs sparsis subpedicellatis, disco e rufo- 

 nigrescente,margine (proprio obscuriori pallido) tiialiodeque integerrimocincto. 



Collema corticoh, Taylor, New Lichens in Hook. Loud. Journ. Bot. t. vi. p. 19'). 



Parmelia molybdena. Herb. Willd.I P. Jpalachensis, Spreiig. in Herb. Floerk ! 



Trunks; fertile. Common also about Boston, and occurring in Pennsylvania, 



