150  LEJEUNEAE OF THE UNITED STATES AND CANADA 
28 x 23: underleaves distant, about the size of the lobules or a D 
little smaller, orbicular, 0.15 mm. long, strongly convex postically, 
gradually narrowed toward base, bifid about one half with obtuse 
to acute lobes separated by a sinus varying from narrow and acute 
to broader and obtuse, margin crenulate from projecting cells: 
inflorescence autoicous: 2 inflorescence sometimes on a leading — 
branch, sometimes on a short branch, innovating on one side, 
the innovation often but not always floriferous and branched ; 
bracts complicate, unequally bifid, the lobe somewhat spread- 
ing, oblong, rounded at the apex, o.5 mm. long, o.3 mm. wide, 
margin crenulate, lobule narrowly oblong, rounded to obtuse at 
apex, 0.25 mm. long, 0.12 mm. wide; bracteole free or nearly 
so, ovate-oblong, 0.4 mm. long, 0.25 mm. wide, bifid about one 
fourth with acute lobes and sinus, margin crenulate; perianth 
about half exserted, oblong-obovoid, 0.9 mm. long, 0.5 mm. wide, 
. gradually narrowed toward base, rounded above and with a short 
beak, terete below, sharply five-keeled in upper half or third, the 
keels crenulate from projecting cells, becoming blunter with age: 
$ spike occupying a short branch, bracts in two to four pairs, 
strongly inflated and with strongly arched keel, subequally bifid 
about one fifth with rounded lobes, cells plane ; bracteoles limited 
to base of spike, similar to the underleaves, but smaller: antheridia ， 
in pairs. 
Type-locality, Ireland (Lindberg). 
On rocks, Newfoundland (Waghorne); Nova Scotia (Ma- 
coun). The species is also known from Great Britain and from — 
Norway. 
Lejeunea patens and the two species which follow are so nearly 3 
allied to one another that they have given rise to much confusion. : 
The elucidation of their synonymy is due largely to Lindberg, who 
was the first to distinguish clearly between Z. serpyllifolia Lib. 
and L. patens. Although he described the latter as a distinct spe- 
cies, he threw doubts on its validity, recognizing the close relation- - 
ship which exists between the two species. At the time Z. patens 
was published, it was taken for granted that Z. serpyllifolia Lib. 
was the same as Jungermannia serpyllifolia Dicks.; but in 1879 
; ve 
Lindberg discovered that the type-specimen of Dickson's spe 
cies in MIN with his Zejeunea patens. The name “ Lejeunea 
serpyllifolia,” however, cannot now be taken up for Z. patens, ON 
account of the older Z. serpyllifolia of Libert. At the same time - 
e A AA 
* Musc. Scand. 2, footnote, 1879. 
