BRACHIOLEJEUNEA CORTICALIS 131 
with a high, narrow, postical keel, antical surface plane or nearly so, 
keels not winged: 3 inflorescence borne on 2 plants, occupying 
ordinary branches or innovations, usually proliferating and some- 
times repeatedly floriferous ; bracts in six to twelve pairs, similar ` 
to the leaves, but with smaller, less widely spreading lobes, more 
strongly arched keels and larger, more inflated lobules, truncate 
to retuse at apex; bracteoles similar to underleaves, found 
throughout spike ; antheridia borne singly : spores greenish, thick- 
walled, minutely verruculose, averaging 34, in short diameter. 
Type-locality, New Orleans and Louisiana (Drummond). 
On trees. Florida (J. D. Smith, Underwood, Straub) ; Ala- 
bama (Mohr) ; Louisiana (Drummond, Langlois). The species is 
widely distributed in tropical America. 
Exsic.: Musc. Amer. St. Merid. 170 (as Jungermannia auri- 
culata). Hep. Amer. 133 (as Zejeunea (Mastigo-Lej.) auriculata). 
Mastigolejeunea auriculata belongs to a tropical and subtrop- 
ical genus which has no other known representatives in the United 
States. The species bears, however, a certain superficial resemb- 
lance to Brachiolejeunea corticalis, with which it has been confused. 
The latter species is readily distinguished by its crenulate lobules, 
larger leaf-cells, usually double innovation and pluriplicate perianth. 
According to Spruce,* M. auriculata can scarcely be distin- 
guished from the Javan M. humilis (Gottsche) Schiffn., to which 
he would also reduce M. repleta (Tayl.). Stephani f states that 
all three species are amply distinct. The writer has examined a 
specimen of M. humilis and finds that this species, although very 
close to M. auriculata, differs in its smaller size, in its much less 
variable lobule, which ends in a long outwardly curved tooth 
consisting of three or eight cells in a single row, in its more 
emarginate underleaves and in the broader lobes and lobules of its 
perichaetial bracts. According to Stephani M. repleta is distin- 
guished by its apiculate leaves. 
5. BRACHIOLEJEUNEA CORTICALIS (Lehm. € Lindenb.) Schiffn. 
PLATE 18, Fics. 1-11 
Jungermannia corticalis Lehm. & Lindenb. ; Lehmann, Pugil- 
lus, 4: 50. 1832. 
* Hep. Amaz. et And. 103. 1884. 
T Hedwigia, 29: 9. 1890. 
