﻿20 Howe: The Anthocerotaceae 



late, ecostate, 6-8 cells thick in axile parts, cavernose, becoming 

 at the margin gradually 3- or 2-stratose, now and then glandular- 

 thickened ; surface-cells distinct, translucent, lightly protuberant, 



subrhombic, trapezoidal, or oblong-pentagonal, 35-75 X 30-35 PI 

 Nostoc colonies spherical : monoicous : antheridia in groups of 3, 

 or 4: involucres short, sometimes united in pairs, cylindrical- 

 oblong, or by contraction at base and mouth, dolioform or sub- 

 globose, .85-1.25 X -5--9 mm., incrassate except at the thin erose 

 or subentire mouth: capsule black, erect or a little curved, 

 3-6 X -3--5 mm., thick-walled, with numerous stomata, the valves 

 rigid or slightly flexuous when dry, brittle and often broken ; 

 columella sometimes appendiculate ; spores fuscous or black, 

 rounded-tetrahedral, densely and rather minutely muriculate on 

 both the inner and outer faces, 48-65 p in maximum diameter ; 

 sterile cells short, nearly as broad as long, without spiral thicken- 

 ings, separate or variously adherent, often shriveled and incon- 

 spicuous. (Plate 326.) 



Exsicc. Can. Hep. 81 (as A. punctatus). 



" Abundant on earth subject to inundation at the outlet of 

 Leamy's Lake, near Hull, Quebec, 6th October, 1889 " (Macoun). 



Anthoceros Macounii is allied to A. Ravenelii Aust., from which 

 it is clearly distinct in the shorter capsule, in the much smaller, 

 more angular spores, with the short papillae mostly separate, 

 never (in the specimens seen), passing into vermicular anastomos- 

 ing lines, and in the more fragmentary, less abundant sterile cells. 

 Distinguished at once from A. pitnctatits by the short capsules, 

 the mostly larger, merely muriculate, not echinulate or setose- 

 papillate spores, and by the reduced abortive sterile cells; the 

 spores, too, in A. Macounii are almost uniformly roughened over 

 the entire surface, while in A. punctatus the inner faces of the 

 spores are nearly always simply foveolate-reticulate. 



NOTOTHYLAS Sulliv. Muse. Allegh. [Exsicc] nos. 289 and 



290, with diagnosis. 1845. Id. [Reprint of tickets] 



69. 1 846. 



[Carpobolus Schwein. Jour. Philad. Acad. 2: 361. 1822. Not 



Adans. Fam. 2: 8. 1763.] 



[C 



Thallus orbicular, laciniate, or with broad, rounded, crenulate- 

 incised lobes, ecostate, of more than one layer of cells throughout. 



