1908] Evans,— Notes оп New England Hepaticae,— VI 187 
it is often restricted to the uppermost bracts. Even in the borders, 
however, certain differences are to be observed. In №. erenulata 
the marginal cells lie in the plane of the leaf and are considerably 
larger than the cells just within; in N. crenuliformis they lie in a 
different plane and form an elevated ridge around the leaf, but the 
contrast in size is less marked. ‘The remaining leaf-cells also show 
differential characters: in №. crenulata they average about 35 p in 
the middle of the leaf, and their walls are either thin throughout or 
show minute trigones; in N. crenuliformis the median cells average 
about 25 и and show distinct trigones. №. crenuliformis is further 
distinguished by its place of growth (N. crenulata preferring sandy 
banks and roadsides), by its numerous flagella, and by its reddish 
rhizoids. Тһе last peculiarity indicates an approach to N. hyalina 
and N. obovata, both of which show a uniform cell-structure in their 
leaves. 
4. LOPHOZIA ATTENUATA (Mart.) Dumort. Recueil d'Obs. sur 
les Jung. 17. 1835. Jungermannia gracilis Schleich. Pl. Crypt. 
Exsic. Helvet. 3: 60. 1804 (nomen nudum); Lindberg, Musc. 
Scand. 7. 1879. J. quinquedentata 8 attenuata Mart. Fl. Crypt. 
Erlangensis 177. pl. 6, f. 50c. 1817. J. attenuata Lindenb. Nova 
Acta Caes. Leop.-Carol. 14, suppl.: 48. 1829. J. quinquedentata В 
gracilis Hüben. Hepat. Germ. 203. 1834. J. barbata, var. atten- 
uata Nees, Naturgeschichte der europ. Leberm. 2: 163. 1836. Lo- 
phozia gracilis Steph. Bull. de l'Herb. Boissier II. 2: 47. 1902. 
Barbilophozia attenuata Loeske, Verhandl. Bot. Ver. Prov. Branden- 
burg 49: 37. 1907. According to the prevailing codes of nomen- 
clature Jungermannia gracilis of Schleicher was not adequately 
published by its author. ‘The name first appeared in a set of exsic- 
catae of Swiss cryptogams, issued early in the last century. ‘The 
specimens were distributed with printed labels, but no diagnoses ac- 
companied the species which Schleicher considered undescribed. The 
names of these new species are therefore to be regarded as nomina 
nuda, unless subsequent authors have republished them either with 
descriptions or with the citation of synonyms. In the case of J. 
alpestris Schleich. this was soon done by Friedrich Weber,! so that 
this name is now universally recognized. In the case of J. gracilis, 
however, adequate publication was delayed for many years, although 
1 Hist. Musc. Hepat. Prodr. 80. 1815. 
