Evans: HEPATICAE OF PuERTO Rico 205 
cence and floral organs there are also important differences, C. ac-_ 
cedens being autoicous instead of dioicous and developing much 
broader wings on the lateral keels of the perianth. The two spe- 
cies differ finally in place of growth, C. angulistipa being found on 
bark while C. accedens prefers living leaves. 
Among the species of Prionolcjeunea, P. microdonta, which has 
not yet been reported from Puerto Rico, resembles C. angulistipa 
in its general appearance, in its blunt leaves, in its subfloral inno- 
vations, and in the characters of its perianth. The leaves of 
P. microdonta, however, are more delicate in texture, more sharply 
denticulate and are usually exocellate, although Spruce apparently 
attributes ocelli to the species.* It differs further in its autoicous 
inflorescence and in its normally abbreviated female branch, as 
well as in its lack of gemmae. 
VEGETATIVE REPRODUCTION IN CYCLOLEJEUNEA f 
According to Cavers,{ discoid gemmae have been recorded in 
Radula, Porella, Frullania and the following genera of the Lejeu- 
neae: Metzgeriopsis, Colurolejeunea, Cololejeunea, Lejeunea and 
Odontolejeunea. To these Diplasiolejeunea may be added, and it 
is probable that further study will lengthen the list still more. 
Under the genus Odontolejeunea the only species mentioned is 
O. mirabilis Steph. ms., which we know merely from one of Goe- 
bel’s figures representing a single gemma.§ Judging from this 
figure alone the species should be referred to Cyclolejeunea rather 
than to Odontolejeunca, the method of attachment of this gemma 
being the same as in C. Peruviana. The source of most of our 
information on these interesting reproductive bodies’ is Goebel’s 
Paper on “epiphytische Farne und Muscineen,” || which was based 
largely on specimens collected in Java. 
In the species of Cyclolejeunea, studied by the writer, the 
gemmae are all composed of a single layer of cells. Each gemma 
is borne ona marginal leaf-cell, which projects slightly beyond the 
* Hep. Amaz. et And. 158. 1884. 
A short account of the vegetative pectic on in Cyclolejeunea was read before 
the Society of Plant Morphology and Physiology, Philadelphia, December, 1903. se 
Stract in Science, II. 19: 415. 1904. The undescribed species referred to is C 
angulistipa, 
£ New Phytol. 2: (15)-(20). 1903. 
¢ Organographie der arene mete f. 175, f. 1898. 
| Ann. Jard. Buitenzorg, 7: 3. pl. r-g. 1887. 
