26G Hhodora [December 



2. ScALiA HooKERi (Lycll) S. F. Gray, Nat. Arr. British PI. 

 1: 705. 1821. Jungermannia Hookeri Lyell; Sowerby, Engl. Bot. 

 36: pi. 3555. 1814. Mniopsis Hookeri Dumort. Comm. Bot. 114. 

 1822. Lcjeunca Hookeri Spreng. ; Linnaeus, Syst. Veg. ed. 16, 4: 234. 

 1827. Gymnomitrium Hookeri Corda; Opiz, Beitr. zur Naturg. 651. 

 1829. Mniopsis acutifolia Dumort. Syll. Jung. 75. 1831. Haplo- 

 mitrium Hookeri Nees, Naturg. der europ. Leberm. 1: 111. 1833. 

 H. Cordae Nees, /. c. 1: 112. 1833. On damp rocks, in a mat of 

 Pellia Necsiana (Gottsche) Limpr., Huntington Ravine, Mt. Wash- 

 ington, New Hampshire, about 4800 feet altitude, August 7, 1917 

 {A. W. E.). New to America. 



It is a great satisfaction to be able to record this rare and distinct 

 species, representing a monotypic genus, as a member of our flora. 

 Unfortunately the material collected is exceedingly scanty, consisting 

 of a few antheridial shoots, but the plant is so different from all other 

 northern Hepaticae that there is little danger of mistaking it. S. 

 Hookeri was supposed to be confined to Europe, where it is widely 

 distributed without being anywhere abundant. It was originally 

 discovered in 1812 by Charles Lyell in the New Forest, Hampshire, 

 England, near the southern coast, and is now known from several 

 other localities on the British Isles and also from Norway, Sweden, 

 Finland, Denmark, Germany and Austria. In the northern part of 

 its range it sometimes descends to the sea level; in the southern part 

 it seems to be confined to higher altitudes. The plants usually grow 

 singly or in small tufts and are difficult to detect in the field. In most 

 cases they occur scattered among other bryophytes, species of Ric- 

 cardia or Pellia being perhaps their most common companions. 



Full descriptions of Scalia Hookeri, many of them accompanied 

 by figures, are available,^ and the species served as the basis for an 

 important monograph by Gottsche,^ a work which ranks as a classic 

 in the literature of hepaticology. It is therefore unnecessary to 

 describe the plant in detail. It is hoped, however, that the following 

 brief account of its more distinctive features may prove of interest. 



' See, for example, the following: Hooker, British Jung. pi. .54. 1814; Carringlon, British 

 Hep. 1. pl.l,f.l. 1874; Lindberg, Rev. Bryol. 12: 33-36. 1885; Pearson, Hep. British 

 Isles, 427. pi. 189. 1901; Warnstorf, Kryptogamenfl. der Mark Brandenburg 1: 134. /. ;. 

 1902; K. Muller, Rabenhorst's Kryptogamen-Flora 6: 399. /. 227. 190 ; Macvicar, 

 Student's Handb. British Hep. 88./. ;-S. 1912; C. Jensen, Danmarks Mosser 1: 60. f. 1-3. 

 1915. 



2 Anatomisch-physiologische Untersuchungen uber Haplomilrium Hookeri N. v. E., mit 

 Vergleichung anderer Lebermoose. Nova Acta Acad. Leop. -Carol. 20: 267-398. pi. 13-20. 

 1843. 



