MAstiGo-LEJEUNEA. 101 
These agree in habit; in the almost constant-presence of flagella ; 
in the closely-set leaves, which are lingulate or ligulate—or at least 
appear so from a wide incurvation of their postical margin ; in the 
cuneate, retuso-truncate or emarginate underleaves ; in the repeatedly 
innovant 9 stems or branches, and in the trigonous perianth. But 
in 
Thysano-Lejeunea the leaves and underleaves are often. finely denti- 
culate or spinulose, and the triquetrous perianths spinose at the 
winged edges; whereas in 
Trigono-Lejeunea, leaves, underleaves and perianths are quite 
entire. 
These are the only tangible differences, except a slightly closer 
texture in Thysano-Lejeunea, and they can scarcely be regarded as 
more than sectional. 
If, however, for the sake of retaining the name Thysananthus, 
which has already been applied by Lindenberg to one of these 
groups, we prefer to regard each group sub-generic, then our first 
section will stand as Mastigo-Lejeunea proper. 
Mastico-LesEUNEA normalis. 
(sive T'rigono-Lejewned), 
Hab. In arborum cortice, raro in saxis; planitiem diligit, neque in 
montes nisi humiliores ascendit. 
Distr. Tres species in regione Amazonica et Subandina degunt, qua- 
rum una, M. L. awriculata (Wils.) in planitie solum ad fl. Amazonum 
ripas observavi; in Andium Peruvie radicibus paulo frequentior est ; 
per orbem terrarum autem in terris tropicis et subtropicis late distributa 
est, primum in America boreali extratropica a cl. DRUMMOND inventa ; 
ex Indiz orientalis diversis locis, sub nom. Phragmicome. versicoloris 
Lehm. et Lg., lectam habemus. Ceeteras duas species ad fl. Negro et 
Orinoco legi, Alize paucee species in regione paleotropica crescunt, e9., 
Phragmicoma humilis Gottsche et Phragm. ligulate. Kurz. 
A. Perianthia triquetra, faciebus levibus vel raro carinuld und alterdve 
percursis. 
1. M. L. auriculata, Monoica. Caules parce innovando-floriferi. — F. 
abrupte acuta obtusave. Br. lobo subacuto, lobulo sepius rotundato. 
Per. emersa pyriformia tenuirostria. 
[M. L. humilis (G.) Dioica? Caules subpinnati, ramis seepe dichotomis. 
F. obtusata raro abrupte subacuta. Br. lobulo retuso subobeordatove. 
Per. emersa obovato-oblonga, alte triquetra vel (carinula postico- 
laterali adject&) asymmetrice 4-carinata.—Java.—A M. L. wuriculata 
wore separanda. | 
2. M. L. innovans. Monoica. Caules creberrime innovandi, fl. 2 con- 
fertissimis. F. apice semicirculari rotundata. Br. lobo rotundato, 
lobulo obeordato. Per immersa obcordato-obovata triquetra, faciebus 
leevibus. 
[|M. L. ligulata (N.; L. et Ldng.) Dioica, Caules inferne pirnati, superne 
