— 40 — 
Nees make no mention of the gemmae; Schiffner says merely that they 
are pale. The Carrigain Pond specimens at'e provided therewith. They are 
watery green, 3- or 4-angled, very thin-walled, one-celled and clinging 
together chainlike by twos and threes. These are young gemmae. 
L. has probably been frequently overlooked among our New 
England mountains, and should be sought in Vermont. 
L. co 7 ife 7 'tifolia, a recent species of Schiffner’s, and but a few times col- 
lected in Europe, was first found in New England, by the Cowles party, on 
Mt. Katahdin, and was announced by Dr. Evans in Rhodora for March, 1907. 
Subsequently the writer detected it among some old material from Mt. 
Mansfield, but as it was collected in igo6, she must confess to no longer 
recalling jthe exact spot where it was found. From the appearance of the 
plant, it grew upon the ground, as the under side is full of specks of mica 
schist. 
Schiffner says “it exhibits however also some characters peculiar to 
itself, especially in the collective aspect of the plant, so that once rightly 
known it is easily to be recognized again by the practised eye.” This pecu- 
liar effect lies in the crowded leaves, from which its name is derived. 
“ It grows in fiat, thickly interwoven tufts on alpine humus dr moor- 
ground, also over earth-covered stones, in fairly damp as well as drier situ- 
ations — the plants are mostly i cm. long, creeping, with ascending tips, 
and very numerous rhizoids.” They are tinged with brown like Marsupella 
sphacelata. “The leaves are thickly and almost transversally attached, 
and concave, often also with the tips somewhat bent over and surrounding 
the stem on the dorsal side, so that seen from above the effect is ladder-like, 
giving the plant its characteristic appearance.” 
The leaves are broadly elliptical, with a somewhat unsymmetrical, 
broad, obtuse sinus, with slightly unequal lobes, often distorted by gemmae. 
The leaf-cells have thin walls and small trigones. The involucral leaves are 
larger than the stem-leaves, and of similar form, although more deeply and 
sharply divided, with sharp tips to the lobes, the bracteole is about two- 
thirds the length of the involucral leaf, and connate with it far up, so that 
the latter appears unequally trifid. 
Schiffner states that the European specimens are abundantly fertile; 
but the Katahdin plants are sterile, while the Mansfield plants have some 
involucral leaves, but no developed perianths. The species is dioicious. 
The perianth is green, only the little teeth about its mouth hyaline; rather 
small, under the circumstances, plicate at the strongly narrowed mouth, 
