MACOUNII (Aust.) Aust. Hep. Bor. Am. no. 55.
1873.
Jungermannia ilacounii Aust. Proc. Phila. Acad. for 1869 : 222. 1869.
Gametophyte a short creeping more or less branched leafy stem ; leaves contiguous or somewhat imbricate, broadly spread ing, bifid a little beyond the middle, the lobes spreading and broadly subulate, 2-4 cells wide at base, mostly acute; leaf-cells 15-18 p in diameter ; underleaves wanting: dioicous ; perianth about 0.7 mm. long, whitish, ovate-fusiform, the mouth narrowed
and ciliate; involucral leaves 2 or 3 pairs, appressed, 2-3-cleft nearly one-half their length, irregularly spinulose. Sporophyte not seen.
On rotten logs, mountains of New England (Austin), Ontario and British Columbia (Macoun). The plant was distributed by Austin : Hep. Bor. Ani. 55. The species is rarely collected.