Дънамитнов 179 
ments of 2-4 cells, sometimes (Anthoceros sp. and Dendroceros— 
in tropics and southern hemisphere) with one or more well devel- 
oped spiral bands, or, more commonly (pseudo-elaters), with spiral 
thickenings rudimentary or wanting. 
Three genera, Anthoceros, Dendroceros, and Notothylas, are or- 
dinarily recognized, of which only the first is known to occur 
within our limits. 
АМТНОСЕКОЅ L.Sp РЕ Шо 1754 Ек Mich, Nov. PE 
Gen. fO, РО ^ 7, 5 1220. 
Thallus suborbicular, variously lobed or irregularly dissected, 
now and then somewhat ribbon-shaped and subdichotomous, of 
more than one layer of cells throughout, costa wanting, indistinct, 
or rarely prominent; monoicous, proterandrous, or sometimes di- 
oicous (?)*; capsule erect, bivalved, much exceeding the involu- 
cre in length, usually very long, with stomata (in the North Amer- 
ican species). Spores granulose-papillate, tuberculate, or echinu- 
late, rarely nearly smooth ; sterile cells (in all our species) without 
spiral thickenings. 
Key to the Species. 
Thallus with peduncled tubers from ventral surface. 1. 4. phymatodes. 
Thallus without ventral peduncled tubers 
Spores fuscous or black. 4. 4. fusiformis. a 
Spores yellow 
Spores with a few (8-15) crescentic verrucae on convex (outer) surface, o 
nearly smooth; thallus usually with me sometimes peduncled, aan 
ular-thickeni . А. Pearsoni 
Spores thickly ا‎ mM 3 А. Car жасам occidentalis. 
I. ANTHOCEROS PHYMATODES М. А, Howe, Bull. Torr. Bot. Club, 
25:12. M. 324, 225. 1898. 
Thallus dark green, blackening on drying, dissected ; the seg- 
ments dichotomous, oblong or linear in sterile plants, broader in the 
fertile, 4-10 mm. x.5—2.5 mm., prostrate or very slightly ascending 
at the apices, at first radiate, becoming later intricately entangled, 
narrowly canaliculate dorsally, with ascending sinuate or repand 
margins, obtuse, carinate with a broad, thick, very distinct or some- 
times obsolescent, naked or sparingly radiculose costa, this occupy- 
ing nearly the whole of the narrower segments and sending down 
here and there a fleshy or elongated and slender process (.1—.4 
* Certain species of Anthoceros have been described as dioicous, yet in a genus of 
which the best known representatives are proterandrous, and in which the archegonía 
are observed with so much difficulty, it may be suspected that careful investigation, by 
modern methods, would show proterandry to obtain in all. 
