1923] Evans, — Notes on New England Hepaticae, — XVII 95 



doubt of its identity with B. denudata; the second specimen (according 

 to a fragment in the Mitten Herbarium) represents a closely allied 

 but apparently distinct species, widely distributed in the Pacific 

 coast region from Alaska to Washington. This species, for which 

 the specific name ambiguum may be retained, will be considered in 

 another connection. 



4. Scapania nemorosa (L.) Dumort. Recueil d'Obs. sur les Jung. 

 14. 1835. Jungermannia nemorosa L. Sp. Plant. 1132. 1753. 

 Scapania nemorosa is one of the commonest and most widely distri- 

 buted of the leafy Hepaticae in Europe and North America. It is 

 abundant in all the New England States, its range extending from 

 the sea level to an altitude of five thousand feet or more. Although 

 it attains its best development on moist rocks, it grows also on drier 

 rocks, on banks in the woods, in swamps, and even on old logs; and 

 it is not surprising that it occurs in numerous forms. Some of these 

 are very different in appearance from one another, and yet it is 

 difficult to distinguish them clearly on account of the existence of 

 intermediate and intergrading forms. Within recent years, however, 

 the attempt has been made to segregate out certain forms as distinct 

 species. ( )f these segregates the following three occur in New England, 

 and their claims for recognition may therefore be briefly considered: 

 S. Joergensenii Sehiffn., S. Austinii Warnst., and S. recurvifolia 

 Warnst. 



The first of these segregates, S. Joergensenii, 1 was based on material 

 collected by the Norwegian botanist, E. Jorgensen, in the Blaamanden 

 Mountains, near Bergen, Norway, at an altitude of 450-500 m. 

 When Miiller 2 published his monograph of the genus Scapania he 

 gave a full description of S. Joergensenii, with illustrations, still 

 citing the original material only and emphasizing the close relation- 

 ship of the plant to S. nemorosa. He has since reduced it to varietal 

 rank under S. nemorosa and has listed additional specimens from 

 Alsace, Baden, Bohemia, the Fichtel and Harz Mountains of Germany, 

 and the Thuringian Forest. 3 He has noted its occurrence also in 

 North America, without citing definite stations, but the writer is 

 able to supply the following from the specimens in the Yale Herbarium : 

 Mt. Clinton, Mt. Pleasant and Tuckerman's Ravine, White Moun- 



i See Miiller, Bull. Herb. Eoiss. II. 1: 607. 1901. 



'Nova Acta Acad. Caes. Leop. Carol. 83: 180. pi. 23. 1905. 



3 Rabenhorst's Kryptogamen-Flora 6 2 503. 1915. 



