104 NORTH AMERICAN FLORA [VorumE 15 
sometimes only vertically grooved, projecting about 200» above the rim; lid and calyptra 
not seen: spores rough, 12-16 uw in diameter. 
TYPE LOCALITY: Orizaba, Vera Cruz. 
DiIstTRIBUTION: Mexico; Guatemala; Jamaica. 
Exsicc.: Pringle, Musci Mex. 10472. 
7. AUSTINELLA R. S. Williams, Bryologist 14: 70. 1911. 
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, erect base, abruptly narrowed to a narrowly lanceolate, grooved point; leaf-margins 
flat or mostly so and serrulate above; cells of the leaf-blade distinct and nearly or quite smooth 
on both sides; costa stout, semiterete, excurrent, somewhat rough on the back above, in cross- 
section near the middle showing 9 or 10 guide-cells with large stereid-bands and more or less 
humerous accessory guide-cells both above and below, with outer cells somewhat differentiated; 
cells in the lower part of the leaf linear to somewhat elongate-hexagonal with more or less 
colored, mostly thickened, rarely slightly pitted walls, the alar not or slightly differentiated; 
upper part of the leaf of angular cells, nearly square to 2 or 3 times longer than wide, the 
narrow upper blade and margin of a double thickness of cells. 
Type species, Syrrhopodon Rauei Aust. 
1. Austinella Ravei (Aust.) R. S. Williams, 
Bryologist 14: 70. 1911. 
Syrrhopodon ? Rauei Aust. Bull. Torrey Club 6:74. 1876. 
Dicranodontium inundatum Small, Mosses S. U.S. 51, hyponym. 1897. 
Dioicous: male flowers 2 or 3 in number, scattered along the upper part of the stem on 
very short, axillary branches, the outer perigonial leaves abruptly narrowed and spreading 
from a short, broad base, the inner leaves much shorter, entire, enclosing about 6 antheridia 
with few, shorter, paraphyses: fertile plants in extensive mats, dull yellowish-green at the 
surface, dark-brown within; stem with a central strand and about 3 rows of thick-walled outer 
cells, slightly radiculose below, somewhat branching above, up to 3 cm. high: upper stem- 
leaves 4-5 mm. long, spreading-flexuous, scarcely crispate, from a clasping, ovate or obovate 
base scarcely 1 mm. long, with the margin not quite entire, abruptly narrowed to a somewhat 
grooved, lanceolate point 3-4 times as long, irregularly serrulate on the flat margins about one 
half down and smooth or nearly so on both sides or somewhat rough on the back towards the 
apex; costa at the base about 100. wide and one fourth the width of the leaf, semiterete, 
slightly excurrent, in cross-section showing 9 or 10 guide-cells, with stereid-bands and some 
accessory guide-cells above and below and outer cells more or Jess differentiated; lower leaf- 
cells mostly rectangular with somewhat thickened, brownish walls, rarely slightly pitted, the 
alar ones often broader, very rarely forming a rather distinct group; upper leaf-cells shorter, 
square to rectangular, about 6 » wide and 1-3 times as long; narrow blade or border of the 
upper part of the leaf of a double thickness of cells; fruit unknown. 
Type LOCALITY: Onoko Glen, Pennsylvania. 
DistTRIBUTION: Known only from the type locality and Tallulah Falls, Georgia. 
ILLUSTRATION: Bryologist 14: 71. f. 1-4. 
Exsice.: Small, Mosses S. U.S. 51. 
8. HOLOMITRIUM Brid. Bryol. Univ. 1: 226. 1826. 
Pseudautoicous. Male plants minute, mostly attached to the older perichaetial buds 
by tomentum or sometimes growing from small balls of protonema in the axils of leaves a 
little below the perichaetium. Fertile plants mostly of medium size, growing in compact 
tufts with branching, tomentose stems sometimes flagelliferous. J.eaves mostly narrowed to 
a lanceolate, serrulate point, crispate when dry (in H. piliferum gradually narrowed to a 
flexuous, smooth hair-point, and in H. Wrighttt and H. Maxoni the upper leaf about as broad 
as the basal part and tubulose, erect-incurved when dry); costa usually percurrent, smooth or 
somewhat serrulate on the back above, in cross-section showing mostly a median row of 
guide-cells with stereid-bands above and below and outer cells sometimes differentiated; 
