124 LEJEUNEAE OF THE UNITED STATES AND CANADA 
angled when young, the keels roughened from projecting cells or 
sometimes with narrow rudimentary wings: & spikes occupying 
short branches, oblong ; bracts closely imbricated in two to four 
pairs, strongly inflated, slightly and subequally bifid with rounded 
lobes and strongly arched keel; bracteoles similar to the under- 
leaves but smaller, limited to base of spike: antheridia in pairs. 
Type-locality, Salem, North Carolina (Schweinitz). 
On rocks and trees. Connecticut (Hall, Evans); New York 
(Peck); Pennsylvania (James, Lea); Delaware (James, Commons); 
District of Columbia (Coville, Holzinger) ; Virginia (Mrs. Britton 
and Miss Vail); West Virginia (Millspaugh); North Carolina 
(Schweinitz) ; South Carolina (Green); Tennessee (Underwood); 
Georgia (Underwood, Small); Alabama (Mohr); Mississippi 
(Lloyd and Tracy); Missouri (Russell); Arkansas (Coville); 
Louisiana (Langlois). | 
Exsic.: Musc. Alleg. 262 (as Phragmicoma clypeata). Hep. 
Bor.-Amer. 95 (as Phragmicoma clypeata) Hep. Amer. 50 ۰ 
(as Lejeunea (Archi-Lej.) clypeata). : 
Archilej.unea clypeata and the two following species are very 
closely related. They differ from typical members of the genus in 
their pale color, less robust habit and short antheridial spikes. In 
these peculiarities they show an approach to the genus Cheilole- 
Jeunea, from which their undivided underleaves should probably E 
exclude them. Recent writers on the hepaticae, however, tend to 
ascribe less value to this character than was originally done by 
Spruce, and species with undivided underleaves have been de- 
scribed in the genera Euosmolejeunea, Cheilolejeunea and Pycnole- 
Jeunea. Under these circumstances the generic position of A. c/y- 
Peata and its immediate allies cannot be regarded as thoroughly | | 
established. 
In studying 4. clypeata, the writer has been able to examine 
the type of Jungermannia clypeata from the Schweinitz herbarium, 
the type of Zejeunea Dorotheae from the Lindenberg herbarium and _ 
a portion of the type of Z. calyculata from the Taylor herbarium. 
The specimens in the Schweinitz herbarium labeled Jungermannia 
transversalis have also been examined, as well as the plants which — | 
Schweinitz sent to Torrey under this name. All of these various — 
specimens evidently belong to the same species. In Z. Dorotheae 
and in the plants labeled J. transversalis, the apex of the lobule 
aM 
