ARCHILEJEUNEA SELLOWIANA 127 
Austin incorrectly referred to his “ Phragmicoma xanthocarpa,” 
as synonyms, Jungermannia transversalis Schweinitz and Lejeunea 
catenulata Nees.* The first of these has already been commented 
upon. The second is a distinct species of the genus Veurolejeunea,t 
and its presence in the United States has not been definitely estab- 
lished. According to the synopsis it was found in “ Hymenophyllo 
ciliato et Neckera abietina Hook. Americae septentrionalis." Un- 
fortunately the genus Hymenophyllum is not known from the United 
States, Æ. ciliatum itself being found in tropical America. Weck- 
era abietina (Alsia abietina Sull.), on the other hand, is found in 
California and northward along the Pacific coast, a region from 
which no Lejeuneae have been recorded except the recently de- 
scribed Cololejeunea Macounii of British Columbia. Under the cir- 
cumstances we must exclude Veurolejennea catenulata from our list. 
The most important differences between A. Sellowiana and A. 
clypeata are drawn from their vegetative organs. A. Sellowiana is 
the more robust of the two species; the lobes of its leaves spread 
more widely and are at the same time more falcate ; the lobule is 
oblong instead of ovate-triangular in outline, and its apex is acu- 
minate instead of apiculate; the cells of the lobe have more con- 
spicuous trigones and more numerous intermediate thickenings, 
the latter being practically absent in A. clypeata, its much 
broader underleaves finally are more crowded together and are 
usually subcordate at the base. The perichaetial bracts and 
perianths are so variable in both species that the slight differences 
between them are of little diagnostic value. In A. Sellowiana, 
however, the female flower is usually borne on a short branch, 
while in A. elypeata it is usually borne on a leading branch. Un- 
fortunately even this difference is inconstant. The perigonial 
spikes are essentially the same in both species. 
In the true 4. ranthocarpa (Lehm. & Lindenb.) Steph., the lobe 
is much more strongly convex than in A. Sellowiana, and the mar- 
gin is revolute both at the apex and along the entire postical side. 
In the lobule also the free margin is strongly involute for the 
greater part of its length. The leaf-cells are similar in the two 
* Syn. Hep. 323. 1845. 
+ Spruce, Hep. Amaz. et And. 84. 1884; Schiffner ; Engler & Prantl, Nat. Pflan- 
zenfam. 13: 13%; 1893. 
