266 Rhodora [DECEMBER 
2. Scara Hooxeri (Lyell) S. F. Gray, Nat. Arr. British Pl. 
1:705. 1821. Jungermannia Hookeri Lyell; Sowerby, Engl. Bot. 
36: pl. 2555. 1814. Mniopsis Hookeri Dumort. Comm: Bot. 114. 
1822. Lejeunea 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, l. c. 1:112. 1833. On damp rocks, in a mat of 
Pellia Neesiana (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. 
1 See, for example, the following: Hooker, British Jung. pl. 54. 1814; Carrington, British 
Hep. 1. pl. 1,f. 1. 1874; Lindberg, Rev. Bryol. 12: 33-36. 1885; Pearson, Hep. British 
Isles, 427. pl. 189. 1901; Warnstorf, Kryptogamenfl. der Mark Brandenburg 1: 134. f. 1. 
1902; K. Müller, Rabenhorst’s Kryptogamen-Flora 6: 399. f. 227. 190 ; Maevicar, 
Student’s Handb. British Hep. 88. f. 1-8. 1912; C. Jensen, Danmarks Mosser 1: 60. f. 1-3. 
1915. 
2 Anatomisch-physiologische Untersuchungen über Haplomitrium Hookeri N. v. E., mit 
Vergleichung anderer Lebermoose. Nova Acta Acad. Leop.-Carol. 20: 267-398. pl. 13-20. 
1843. 
