Y Evans: HEpATICAE OF PuERTO RIco 
record is based either on an incorrect label or on a false determi- 
nation. At all events the specimens so labeled, which are quoted 
in the Synopsis, seem to have disappeared. On the whole the 
evidence that S. sguamata occurs outside the American tropics is 
very inconclusive. 
The two species of Séctolejeunea grow preferably on trees, 
although S. sqguamata is occasionally found on rocks. They differ 
somewhat in habit, but both of them exhibit a regular pinnate or 
bipinnate branching. In many cases the plants are distinctly plu- 
mose in appearance, the majority of the branches being limited in 
growth. Both species are conspicuous and differ from most of 
the larger Lejeuneae in their pale or bright green color, which be- 
comes yellowish or brownish only upon age. Not infrequently 
they form pure mats or tufts of considerable extent, but they also 
occur mixed with other species. 
The leaves spread widely from the stem, the lobes being plane 
and varying in outline from ovate to oblong (PLATE I, FIGURE 2). 
They are rounded at the apex, and their margins are entire. The 
lobules are relatively small and bear a strong superficial resem- 
blance to the galeate or clavate lobules which are found in the 
genus /rullania. They are, however, entirely different in struc- 
ture and conform more nearly in this respect to the lobules of 
other Leyeuneae. They are attached to the axis by a long basal 
line which runs almost longitudinally (FIGURE 4). From this line 
the free margin curves abruptly toward the postical margin of the 
lobe, meeting it close to the base and extending just beyond it. 
The margin is entire and appressed to the lobe throughout the 
greater part of its length. The lobule is strongly inflated, form- 
ing a distinct water-sac, and the bulging portion sometimes ex- 
tends beyond the line of contact between the free margin and the 
lobe. The apical tooth of the lobule is curved and slender (FIG- 
URES 12, 13); it is also strongly involute and forms, together with 
the shallow sinus and the basal portion of the margin of the lobe, a 
circular opening into the sac. The keel is short and often in- 
curved, and it is largely to this fact that the lobule owes its pecu- 
liar appearance. The hyaline papilla is not marginal but is dis- 
placed to the inner surface of the lobule, somewhere between the 
base and the apex. In this respect the genus agrees with Odon- 
PS eee me ee Ter Te ee LPN 
