Part 223 (1/2)

3. M. hamata, Lindb. Like the last; thallus much elongated (4' long, 1--1” wide); hairs very long, divaricate and hooked-deflexed, the marginal in twos, rarely with discoid tips; midrib covered above and below with two rows of enlarged lax cells. (M. furcata, _Sulliv._, in part.)--Alleghany Mts. (_Sullivant_).

4. M. conjugata, Lindb. Thallus 1' long, --1” wide, usually dichotomous, the short branches irregular in width, convex above, the margins more or less undulate; hairs rather long, straight, divaricate, the marginal usually in twos, very often disk-bearing; midribs covered above with 2, below with 3--6 rows of enlarged lax cells.--On shaded rocks and trunks of trees, central N. Y., and southward. (Eu.)

33. ANEuRA, Dumort. (Pl. 23.)

Thallus fleshy, prostrate or a.s.surgent from a creeping base; costa obscure. Dicious or moncious. Fructification arising from the under side near the margin. Involucre cup-shaped, short and lacerate, or none.

Calyptra large, fleshy, more or less clavate. Capsule large, oblong-cylindric. Elaters unispiral, in part adherent to the tips of the valves. Spores minute, smooth or minutely roughened. Antheridia immersed in the surface of receptacles proceeding from the margin of the thallus.

(Name from a- privative, and ?e????, a nerve.)

[*] _Thallus narrow (about 1” wide), palmately divided._

1. A. latifrons, Lindb. Thallus cespitose, ascending or erect, usually dark green, 6--9” long, mostly pellucid; branches linear, obtuse and emarginate, plano-convex; cells large, oblong-rhombic; moncious; archegonia 3--10, short, conic; calyptra white, verrucose, pyriform-clavate; capsule oval, brown; spores 12--14 broad, globose, minutely and densely papillose; antheridia globose. (A. palmata of authors; not _Dumort_.)--On rotten logs; common.

[*][*] _Thallus narrow (about 1” wide), pinnate or bipinnate._

2. A. multifida, Dumort. Thallus prostrate, brownish-green, pinnately divided, the primary portion biconvex, somewhat rigid, the branches horizontal, pectinately pinnate with narrow linear divisions; moncious; fructification rising from the primary part or from the branches; involucre fleshy; calyptra tuberculate.--Var. MaJOR, Nees. Primary portion and branches thick, the branches interruptedly pinnate with short obtuse divisions.--On decayed wood and moss in swamps, N. J.

(_Austin_), and south in the mountains. (Eu.)

3. A. pinnatifida, Nees. Thallus pinnately divided or subsimple, flat or somewhat channelled; branches horizontal, the broader pinnatifid or dentate, obtuse; calyptra somewhat smooth.--On dripping rocks, Hokokus, N. J. (_Austin_), N. Haven, Conn. (_Eaton_). (Eu.)

[*][*][*] _Thallus wider (2” or more), simple or irregularly lobed._

4. A. sessilis, Spreng. Thallus dec.u.mbent, irregularly lobed, 1--2'

long, 3--5” wide; involucre none; pedicel --1' long, sometimes folded upon itself and remaining within the calyptra, the capsule thus appearing sessile; antheridia on elongated receptacles.--Wooded swamps.

Elongated floating forms, 5--6' long, have been found in the White Mts.

(_Farlow, Faxon_).

5. A. pinguis, Dumort. Thallus 1--2' long, dec.u.mbent or ascending, fleshy, linear-oblong, simple or slightly lobed, the margin sinuate; dicious; involucre short, lacerate; calyptra cylindric, smooth; capsule brownish, furrowed; antheridia in 2-lobed receptacles.--Wet banks, N. J.

to Ohio, and southward. (Eu.)

ORDER 138. ANTHOCEROTaCEae. (HORNED LIVERWORTS.)

Plant-body a thallus, irregularly branching, flaccid, without epidermis or pores, and more or less vesiculose. Involucre single, tubular.

Calyptra rupturing early near the base, and borne on the apex of the capsule. Capsule dorsal, pod-like, erect or curved outward, more or less perfectly 2-valved, usually stomatose, tapering into a pedicel or often sessile with a bulbous base. Columella filiform. Elaters with or without spiral fibres. Spores flattish, more or less convex-prismatic, papillose or smooth.

1. Anthoceros. Capsule narrowly linear, exsertly pedicelled, 2-valved.

Elaters present.

2. Notothylas. Capsule very short, sessile, not valved below the middle.

Elaters not obvious.

1. ANTHoCEROS, Micheli. (Pl. 22.)