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 memorosa 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 existenee of 
intermediate and intergrading forms. Within recent years, however, 
the attempt has been made to segregate out certain forms as distinct 
species. Of these segregates the following three occur in New England, 
and their claims for recognition may therefore be briefly considered: 
S. Joergensenii Schiffn., S. Austinii Warnst., and S. recurvifolia 
Warnst. 
The first of these segregates, S. Joergensenii,! was based on material 
collected by the Norwegian botanist, E. Jórgensen, in the Blaamanden 
Mountains, near Bergen, Norway, at an altitude of 450-500 m. 
When Müller? published his monograph of the genus Scapania he 
gave a full description of S. Joergensenit, 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? 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- 
1See Müller, Bull. Herb. Boiss. II. 1: 607. 1901. 
t Nova Acta Acad. Caes. Leop. Carol. 83: 180. pl. 23. 1905. 
3 Rabenhorst's Kryptogamen-Flora 6?; 503. 1915. 
