JL'NTJKRMANNIArK.K. (SCALE-MOSSKS. ) 725 



« « Hairy on the maryins and midrib beneath, smooth above; dicecious (n. 1 



monacious). 



2. M. myri6poda, LimH). Tliallus elougated (2' long, |" wide), dichot- 

 omous, the long linear branelics of uniform width, convex aljove, the reflexed 

 margins not undulate; midrib densely pilose beneath; hairs rather long, 

 straight or nodding, the marginal mostly in clusters of 3-6, some with dis- 

 coid tips; midrib covered above with 2 rows of enlarged cells, and beneath 

 with 3-7 (usually 4-C) rows of smaller cells, lax and often indistinct. (M. 

 furcata, «S'M///t'., in part; not yeea.) — Shaded rocks and trees in the AUe- 

 ghanics (Snllivdnl), and southward. 



3. M. hamata, Liudb. Like the last; thallus much elongated (4' long, 

 1 - 1^" wide) ; hairs very long, divaricate and lu)(»ked-deflexed, the marginal 

 in twos, rarely with discoid tips; midrib covered above and below with two 

 rows of enlarged lax cells. (M. furcata, Sullir., in ])art.) — Alleghany Mts. 

 (Snllivanf). 



4. M. conjugata, Lindb. Thallus li' long, ^-1" wide, usually dichoto- 

 mous, 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. ANEtlRA, Dumort. (PI. 23.) 



Thallus fleshy, prostrate or assurgent from a creeping base ; costa obscure. 

 Dioecious or monoecious. 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. Elatera 

 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- j>rivative, and 

 vfvpov, a ucrre.) 



* Thallus narrow {about V wide), pal mately dicided. 



1. A. l^tifrons, Liudb. Thallus cespitose, ascending or erect, usually 

 dark green, 6-9" long, mostly pellucid; branches linear, obtuse and emar"-i- 

 nate, plano-convex ; cells large, oblong-rhombic ; mona'cious ; archegonia 3 - 

 10, short, conic; calyptra white, verrucose, pyriform-davate; capsule oval, 

 brown; spores 12^-14| /x broad, globose, minutely and densely pa])illose; 

 antheridia globose. (A. palmata of authors; not Dumort.) — On rotten logs; 

 common. 



* # Thallus narro}o (about \" ivide), pinnate or bipinnate. 



2. A. multifida, Dumort. Thallus prostrate, brownish-green, pinuately 

 divided, the primary jwrtion biconvex, somewhat rigid, the branches horizontal, 

 pectinately pinnate with narrow linear divisions; monoecious; fructificatit)n 

 rising from the primary part or from the branches ; involucre fleshy ; calvptra 

 tuberculate. — Var. mX.hh:, Nees. Primary portion and branches thick, the 

 brandies interruptedly pinnate with short obtuse divisions. — On decaved 

 wood and moss in swamps, N. J. (Austin), and south in the mountains. (Lu.) 



