ARCH ILEJEUNEA CLYPEATA 
Lejeunea Carolinensis Mont.; G. L. & N. /. c. (as synonym). 
Lejeunea calyculata Tayl. Lond. Jour. Bot. 5: 388. 1846. 
G L & N: Syn. Hep. 752. 1847. 
Lejeunea clypeata Sull.; Gray, Manual, Ed. I., 685. 1848. 
Symbiezidium calyculatum Trevis. Mem. r. ıst. Lomb. III. 4: 
403. 1877. 
Lejeunea (Archi-Lejeunea) clypeata Spruce, Hep. Amaz. et 
And. 90. 1884. 
Archilejeunea clypeata Schiffn.; Engler & Prantl, Nat. Pflanzen- 
fam. 1%: 130. 1893. 
Pale glaucous-green or whitish, growing in broad depressed 
mats: stems prostrate, 0.085 mm. in diameter, closely appressed 
to matrix, irregularly branched: rhizoids scanty, sim le or 
branched : leaves imbricated, the lobe obliquely spreading, slightly 
falcate, broadly oblong to suborbicular, convex, averaging 0.6 mm. 
long and 0.45 mm. wide, slightly revolute at the rounded apex, 
margin crenulate from projecting cells, antical margin rounded at 
base and arching across or just beyond axis; lobule inflated, ovate- 
triangular, 0.2 mm. long, 0.12 mm. wide, keel straight or slightly 
curved, forming a very obtuse angle with postical margin of lobe 
and sometimes almost continuous with it, free margin slightly 
curved, involute to beyond apex, then obliquely truncate to end of 
keel, apex blunt or subacute, consisting of a single projecting cell 
or rarely of two cells; cells of lobe convex with rather thick pro- 
jecting walls and thin vertical walls, trigones distinct though some- 
times small, acuminate, indeterminate thickenings absent except 
sometimes near base of lobe, cells at edge of lobe 15 in diameter, 
in the middle and at the base 19 £: underleaves distant, orbicu- 
lar, 0.2 mm. long, rounded at the apex, abruptly narrowed and 
neither rounded nor cordate at base, very short decurrent and at- 
tached bya slightly curved line of insertion : inflorescence autoi- 
cous or dioicous: 9 inflorescence usually borne on a leading 
branch, rarely on a short branch, innovating on one or rarely on 
both sides, the innovations usually simple and sterile ; bracts com- 
plicate, unequally bifid, scarcely or not at all winged on keel, the 
lobe obovate, slightly falcate, rounded at the apex, 0.75 mm. long, 
0.45 mm. wide, crenulate on the margins, lobule oblong, rounded 
at the apex, 0.4 mm. long, 0.12 mm. wide ; bracteole ovate-oblong, 
0.6 mm. long, 0.4 mm. wide, slightly narrowed toward base, 
truncate or rarely retuse at the broad apex; perianth obovoid, 
0.85 mm. long, 0.6 mm. wide, cuneate toward base, truncate 
above and with a short broad beak, lateral keels sharp, antical 
keel short and low, postical keel long, broad and sharply two- 
