726 JUNGERMANNIACE^E. (SCALE-MOSSES.) 



3. A. pinnatifida, Nees. Thallus pinnately divided or subsimple, flat 

 or somewhat channelled ; branches horizontal, the broader pinnatifid or den- 

 tate, obtuse ; calyptra somewhat smooth. On dripping rocks, Hokokus, N. J. 

 (Austin), N. Haven, Conn. (Eaton). (En.) 



# * # Thallus wider (2" or more), simple or irregularly lobed. 



4. A. sessilis, Spreng. Thallus decumbent, irregularly lobed, 1-2' long, 

 3-5" wide; involucre none; pedicel f-l x long, sometimes folded upon itself 

 and remaining within the calyptra, the capsule thus appearing sessile ; anther- 

 idia 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, decumbent or ascending, 

 fleshy, linear-oblong, simple or slightly lobed, the margin sinuate ; dioecious ; 

 involucre short, lacerate ; calyptra cylindric, smooth ; capsule brownish, fur 

 rowed ; antheridia in 2-lobed receptacles. Wet banks, N. J. to Ohio, and 

 southward. (Eu.) 



ORDER 138. ANTHOCEROTACEJE. (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. Elatera not 



obvious. 



1. ANTHOCEKOS, Micheli. (PI. 22.) 



Thallus dark green or blackish, usually depressed, variously lobe J, with 

 large chlorophyll-grains, frequently glandular-thickened at the apex or in 

 lines along the middle so as to appear nerved. Monoecious or dioecious. 

 Capsule linear, 2-valved, exsertly pedicelled. Elaters simple or branched, 

 often geniculate, more or less heteromorphous, the fibres wanting or indistinct. 

 (Name from &v6os, flower, and Ktpas, horn, from the shape of the capsule.) 



1. A. laevis, L. (PI. 22.) Thallus smooth, nearly flat above ; dioecious ; 

 involucre 1 - 2" long, trumpet-shaped when dry, repand-toothed ; capsule pale 

 brown or yellowish, 1-1^ long; elaters rather short, yellowish ; spores yel- 

 low, nearly smooth, angular. Wet clay banks, from Canada south and west- 

 ward. (Eu.) 



2. A. punctatus, L. Thallus small, depressed, or often cespitose and 

 erect, more or less glandular ; monoecious ; involucre rather short, oblong- 

 linear, slightly repand, sometimes scarious at the mouth; capsule 1" high, 

 black ; elaters fuscous, flattish, geniculate ; spores black, strongly muriculate. 

 iharply angled. Wet banks, Canada to Mo., and southward. (Eu.) 



