16 



centrifuga, Umbilicaria erosa. Cetraria aurescens, Pertii- 

 saria globularis. 



Several species of Umbilicaria cover the inaccessible sur- 

 faces of the beetling cliffs overhanging the ravine, which is 

 filled with the debris, and on which, among other lichens, 

 may be seen the brilliant yellow lepra of some degenerated 

 species not yet ascertained. The entire formation seems to 

 have been of a later date than that of the West River 

 Mountain, and is composed of mica slate capped with gra- 

 nular quartz. Its elevation is inconsiderable, being proba- 

 bly less than one thousand feet. 



West River Mountain offers also much interest to the 

 naturalist. Its lichenose growth is distinct from that of the 

 Mine Mountain. Parmelia ostreata Hoffm : occured here 

 to Mr. R. growing upon the charred wood of the White pine 

 stumps. P. atra grows upon the rocks. Peltigera venosa 

 Hoffm: is sparingly found at its base, while it grows in 

 great abundance and beauty on the moist shady hill sides 

 in the limits of the village of Brattleborough. Upon the 

 exposed roots of the Hemlock, {Abies Canadensis ^^ he de- 

 tected Coniocybe furfuracea, and a rock form of the same 

 on the under side of stones, on the wooded hill sides. Con- 

 iocybe pallida occurred on the dead bark of the ash, and 

 was first brought to Mr, R. by Charles C. Frost of Brattle- 

 borough, to whose researches in botanical subjects Mr. R. 

 expressed himself much indebted. A species of Lecanactis 

 was observed on the trunks of oak, and several species of 

 Callcium, on fences and on the bark of trees. Thelotrema 

 lepadinum was also found. A great variety of interesting 

 spring and autumnal flowers abound. 



Mr. Russell also gave some account of the Cryptogamic 

 vegetation, noticed by him on Mansfield Mountain, one of 

 the highest peaks of the Green Mountain range in Vermont. 

 The subjoined list contains the more important, viz : — 

 Andreea rupestris, Hypnum umbratum, Sphagnum sp : Raco- 

 mitrion sp : Madotheca porella, Biatora decolorans, Biat; 

 vernalis, Biat : icmadophila, Biat : ochrophsea, Lecidea san- 

 guinaria, Cladonia gracilis — var. elongata. CI : vermicula- 

 ris, CI : taurica. Umbilicaria proboscidea, U ; hyper- 

 borea U : erosa. Evernia furfuracea var. b. Cladonia. E. 

 bicolor. Cetraria cucullata. C. pinastri, C. glauca. C. 

 Oakesiana. C. Sepincola. Parmelia stygia. P. ventosa, 

 &c. &;c. 



