527 
slightly decurved when moist, circumvolute-deflexed in drying, 
rather distinctly margined by somewhat inflated subrectangular 
cells, the inferior margin more or less undulate, often narrowly in- 
flexed, the superior repand or here and there caudate-dentate, the 
base long drawn out and projecting beyond the stem, trigones 
small ; ventral lobes and underleaves approximate or more often 
imbricate, sometimes entirely concealing the stem; ventral lobes 
ovate-lanceolate to linear-lanceolate, rarely almost subulate, acute 
or occasionally somewhat obtuse, subfalcate, canaliculate, slightly 
twisted, long-decurrent, nearly discrete, .4—I mm. x .08—.4 mm., 
about 1% as wide as the underleaves, length 2-3 the width of the 
dorsal, undulate-repand above, sparingly caudate-lacinulate on in- 
ner side at base, often also on the outer ; underleaves ovate-lingu- 
late to oblong, a little wider than the stem, apex obtuse, subacute, 
rarely emarginate or slightly cleft, often deflexed, margins plane 
_or recurved, undulate-repand, long-decurrent, the wings with com- 
monly 2 or 3 cauda-like laciniae on either side toward the base: 
dioicous: $ spikes oblong to almost linear, 2-4 mm. in length ; 9 
branch short ; dorsal lobes of bracts subobtuse or acute, the ven- 
tral acute or often subulate-pointed, margins of both subentire or 
denticulate above, ciliate-caudate at base, bracteole large, ovate, 
usually acute, denticulate above, caudate-lacinulate below ; under- 
leaf subtending @ branch acutely emarginate or bifid ; perianth 
‘broadly ovate from a shortly obconic base, somewhat compressed, 
lightly undulate-plicate dorsally, often furnished ventrally with 2 
or three rarely winged carinae, narrowed at the ciliate, subtruncate, 
deeply bilabiate mouth : capsule oval or oval-oblong, exserted by 
about its own length ; spores 29-40 /, minutely echinulate ; elaters 
180-310 #x 10-12 p, 2-(3-) spiral. 
Exsicc. Hep. Am. 31. a 
On stones, under shelving rocks, and on the bark of living 
trees, especially of Quercus agrifolia. California, apparently 
throughout the state (Bolander, Underwood, McClatchie, Howe). 
Type in Herb. Pearson, Knutsford, Cheshire, England. We : 
have seen no specimens of Porella Bolanderi from any station out- 3 
side of California. Can. Hep. no. to (distributed as P. Bolan- 
deri) is, so far as we have seen it, Porella rivularis—in one pocket a 
mixed with P. wavicularis. Can. Hep. no. 11 (issued as Pordla 
Bolanderi var.), from Mt. Benson, Vancouver Island, is Pored/a 
Roellii Stephani. Be : 
In moist, densely shaded places, Porella Bolanderi assumes:a 
more lax, flaccid habit, resembling certain forms of P. rivularis pte 
