Bryophyten, 
43 
Evans, A, W., Hepaticae of Puerto Rico, IX. Brachiolejeunea, 
Ptychocoleus, Archilejeunea, Leucolejeunea, and Anaplolejeunea. 
(Bulletin of the Torrey Botanical Club. XXXV. p. 155—179. plates 
6—8. April 29, 1908.) 
1. Brachiolejeunea, an essentially tropical genus of wide distri- 
bution, with 20 to 30 recognized species, has as its type B. laxifolia 
(Tayl.) Schiffn. Two species of this genus have been reported from 
the West In dies: B. densifolia (Raddi) Evans, comb. nov. ( Frulla- 
noides densifolia Raddi, Jungermannia bicolor Nees, etc.), and B. 
corticalis (Lehm, and Lindenb.) Schiffn.: neither of which is known 
from Puerto Rico. A third West Indian species, however, is here 
described: Brachiolejeunea insularis Evans, sp. nov., from Puerto 
Rico, Cuba and Jamaica, the type being Evans 97 from Cayey, 
Puerto Rico. It is closely related to B. densifolia. The characters 
of the genus as a whole are discussed. 
2. Ptychocoleus Trev., with Phragmicoma aulacophora Mont. 
(1843) as type, is equivalent to the genus Acrolejeunea, as defined 
by Spruce and by Schiffner. In this restricted sense it includes 
between 40 and 50 species of wide tropical distribution. Five species 
are known from America, only one of these, P. polycarpus (Nees) 
Trev., occurring in Puerto Rico. The characters and relationship 
of the genus are discussed, and the single species mentioned is 
fully redescribed with citation of synon 3 r ms. 
3. Archilejeunea. “According to Schiffner, the genus Archile¬ 
jeunea contained 30 species in 1895, and perhaps a dozen new 
species have been proposed since he made his estimate. If, however, 
A. porelloides (Spruce) Schiffn., the first species described by Spruce, 
be selected as the type of the genus, certain species have been 
refered to it which can hardly be considered congeneric with the 
type species. This is the case, for example, with A. pseudocucidlata 
Steph. ( Lejeunea holostipa Spruce), which the writer has already 
made the type of the genus Cyrtolejeunea. It is true of A. xanthocarpa 
(Lehm, and Lindenb.) Steph. and its immediate allies, for the reception 
of which the genus Leucolejeunea Evans has recently been proposed. 
It is also true of A. conferta (Meissn.) Schiffn., which belongs to the 
genus Anaplolejeunea and is even synonymous with its type species. 
If these aberrant forms are removed, the species which are left will 
fully agree with the characters assigned to the genus by Spruce 
and by Schiffner.” Following this the characters of the genus are 
recapitulated. Only 2 species are known from the West Indies, 
viz. A. Auberiana (Mont.) Steph., originally from Cuba, and A. 
Cruegeri (Lindenb.) Schiffn., described originally from Trinidad. 
Only one species is reported from Puerto Rico. A. viridissima 
(Lindenb.) Evans, comb. nov. (. Lejeunea viridissima Lindenb.), the 
type of which is from Caracas, Venezuela. This species is closely 
related to A. Auberiana. 
4. Leucolejeunea Evans, (Torreya, VII. p. 225—229. 1908.) Four 
species of this genus are known at present, in addition to the type 
species, L. clypeata (Schwein,) Evans. One species occurs in Puerto 
Rico, viz. L. xanthocarpa (Lehm, and Lindenb.) Evans. Following 
the description of this the distribution and relationship are indicated. 
5. Anaplolejeunea. This genus as defined by Schiffner contains 
a single species. A. herpestica (Spruce) Schiffn., which proves to be 
indistinguishable from the widely distributed Lejeunea conferta 
Meissn. This, though placed by recent authors in Archilejeunea, is 
said not to be congeneric with typical members of that genus. The 
