34 Evans: HepaTICAE OF PUERTO RICO 
0.25 mm. long, 0.13 mm. wide, bifid about two fifths with acumi- 
nate and ciliate divisions and narrow sinus; perianth unknown: 
3 inflorescence terminal ; bracts in two to five pairs, more or less 
imbricated, strongly inflated, shortly bifid, the lobe orbicular, — 
abruptly apiculate or blunt at the apex, lobule blunt, keel rough- — 
ened in outer part ; antheridia in pairs ( p/. 4, f. 8-77). : 
On living leaves. El Yunque, Avans (42 p.p., 43 p-p-)- i 
Originally collected at Demerara and since found by Spruce in — 
Brazil. 4 
The type specimens of Leyewnea cructanclla in the Taylor her- a 
barium are very fragmentary and are also poorly developed. They 4 ’ 
agree very well, however, with some of the rudimentary specimens a 
from Puerto Rico, and it seems justifiable to refer the latter to : 
Taylor's species in spite of the unsatisfactory condition of the type. 
The specimens in the Lindenberg herbarium, preserved under the 
name ZL. crucianella, are, according to Stephani, a Cololejeunea and — 
are referable to his C. papilliloba, a species known also from 
Brazil.* 
Apparently D. cructanella received its name on account of the 
peculiar form of the leaves when poorly developed. In these 
cases the spiniform teeth are almost as conspicuous as in well- 
developed leaves, while the apical portion of the lobe is scarcely — 
longer than these spreading teeth and is entire or nearly so. This ’ 
condition is seen especially well in ¢ material and is emphasized — 
in Spruce’s description. In well-developed leaves where the ap-_ 
ical portion of the lobe is considerably longer than the spiniform — 
teeth and is distinctly toothed on the margin, the specific name 
loses much of its significance. Spruce placed the species in Lepto- 
Lepunea, probably on account of its diandrous bracts, but it is so 
close to several of the species described in the present paper that 
it ought hardly to be separated from them generically. : 
Among the Puerto Rico species D. bispinulosa is perhaps the 
most closely related to D. cructanella, the two species agreeing in 
the two spiniform teeth of their lobes. In the latter species, how- 
ever, the teeth are longer and broader at the base and the portion 
of the lobe beyond the teeth is much more strongly toothed. 
The attenuate apex also, instead of spreading widely as in D. 
* Hedwigia, 29: 73. 1890; 34: 250. 1895. 
. 
