Marchantia breviloba A. Evans

Marchantia breviloba Evans, Trans. Conn
Acad. 21:265. 1917.
Thallus pale-green, more or less glaucous, sometimes purplish beneath and along the margin, mostly 2-5 cm. long and 0.5-0.8 cm. wide, firm but not leathery; epidermis composed of cells with somewhat thickened walls, locally in 2 layers, averaging about 65 X 28 ju; surfacepapillae lacking; pores usually bounded by 6 circles of cells with 4 (or more) cells in each circle, those of the innermost circle mostly 4, enclosing a broad opening with concave sides; ventral tissue with sclerotic cells and usually with slime-cells; ventral scales in 4 rows; appendages of median scales ovate to orbicular, mostly 0.5-0.65 mm. long and 0.45-0.55 mm. wide, rounded to apiculate at the apex, sparingly and minutely toothed on the margin. Male receptacle borne on a stalk 1.5-2 cm. high, with 2-4 rhizoid-furrows and a single narrow band of green tissue, mostly 1-1.5 cm. broad, deeply lobed, the lobes mostly 6 or 7, palmately spreading; female receptacle borne on a stalk 6-8 cm. long, with 4 rhizoid-furrows and a single broad band of green tissue, mostly 6-8 mm. broad, usually 11-rayed, the rays short, 1 mm. long or less, with one sinus broader than the others, scarcely or not at all dilated at the apex, flat, without surface-papillae; involucre not lobed, ciliate; spores yellowish-brown, about 34 M in diameter, tetrahedral, with narrow wings and low siu-f ace-lamellae; elaters. about 8 M wide. Cupules shortly and irregularly ciliate-dentate, destitute of papillae.
Type locality: Hardware Gap and vicinity, Jamaica. Distribution: Jamaica and Hispaniola; on banks.