- 70 - 
Fig. 24. Mature archegonium, median long, section, June 14. 
V. c., ventral canal cell. e. c., egg ceil; and 16 canal cells. 
Fig. 25. median long. sect, through growing point of thallus X 110 
June 14. Young archegonia. In drier soil. 
Fig. 24a. Median longitudinal section through venter of archegon- 
ium, July 26. Young embryo, 2-celled stage. Increase of 
cell division in walls of venter. 
AUSTINELLA gen. nov. 
R. S WILLIAMS 
Dioicous: stems with few radicles, a distinct central strand and 
brown outer walls composed of about three rows of thick- walled cells; 
leaves spreading-flexuous, from a very broad, imbricate base abruptly 
narrowed to a narrowly lanceolate, grooved point; leaf margins flat or 
mostly so and serrulate above; cells of leaf lamina distinct and nearly 
or quite smooth on both sides ; costa stout, semiterete, excurrent, 
somewhat rough on the back above, in cross-section near middle 
showing 9 or 10 guide-cells with stereid bands and more or less nu- 
merous accessory guide-cells both above and below, outer cells 
somewhat differentiated ; cells in lower leaf linear to somewhat 
elongate hexagonal with more or less colored, mostly thickened, rarely 
slightly pitted walls, the alar not distinctly differentiated ; the upper 
leaf of angular cells, nearly square to 2 or 3 times longer than wide, 
the narrow upper blade or margin of a double thickness of cells. 
This genus is near Trichostomum but has a broad, clasping base to 
the leaf, and cells of upper leaf angular and not papillose. 
Austinelia Rauei (Aust.) gen. nov. 
Syrrhopodon ? Rauei Aust. Bull. Torr. Bot. Club, 6 : 74. 1876. 
Dicranum fulvum Hook, fide Lesq. & James, Manual, 70. 1884. 
Dicranodontium inundatum Small, Exsiccati, Mosses of Southern U, S. 
(nomen undum). 
Dioicous, male flowers, 2 or 3 in number, scattered along upper 
stem on very short, axillary branches, the outer perigonial leaves ab- 
ruptly narrowed and spreading from a short, broad base, the inner 
much shorter, entire, enclosing about 6 antheridia with few, shorter 
paraphyses : in extensive mats, dull yellowish green at the surface, 
dark brown within ; stems with central strand and about 3 rows of 
thick walled outer cells, slightly radiculose below, somewhat branch- 
ing above, up to 2 or 3 cm. high ; upper stem leaves 4 or 5 mm. long, 
spreading-flexuous, scarcely crispate, from a clasping, ovate or ob- 
ovate base scarcely 1 mm. long with margin not quite entire, abruptly 
narrowed to a somewhat grooved, lanceolate point 3 or 4 times longer, 
irregularly serrulate on the flat margins about one-half down, smooth 
