Species of Heterocladium 127 



ing-erect, closely branched, branches short, obtuse, terete ; leaves 

 when dry appressed-imbricated, round-obtuse, nearly entire, re- 

 sembling those of Myunila julacca but having a different areola- 



tion. 



J 



In Europe on exposed rocks at high altitudes. Collected by 



on slate ledges and 

 County, Idaho." 



Mo 



4. Heterocladium Macounii sp. no v. 



Plants small, in dense, spreading tufts, yellowish green to 

 golden brown. Stems, without central strand, stoloniform, 3 to 5 

 cm. long, irregularly branched ; stems and branches curved at 

 tips ; larger branches (secondary stems) pinnate or bipinnate, often 

 subfasciculate, ascending-erect ; paraphyllia few, ovate to linear- 

 lanceolate, serrate ; stem leaves close, appressed when dry, erect- 

 spreading when moist, subsecund, narrowly costate to the middle, 

 .3 to .4 mm. wide, .5 to .7 mm long; from a cordate, subclasping 

 base ovate, gradually to abruptly acuminate, spreading, tips re- 

 curved, margins plane, papillate-serrulate ; larger branch leaves 

 ovate-lanceolate, long acuminate, serrate, more or less secund ; cells 

 of the basal-central area of stem leaves sublinear, .005 to .007 mm. 

 wide, 3 to 5 times as long, gradually passing into the quadrate 

 cells of the basal angles and margins and becoming roundish 

 quadrate to rhombic-oblong above, each cell with usually two small 

 papillae on both surfaces near the ends of its long diameter ; ap- 

 ical cells of smaller branch leaves quadrate, crowned with two 

 papillae. Dioicous ; perichetial bracts whitish, inner long acumi- 

 nate, flexuose-spreading, serrate ; pedicels smooth, shining, flex- 

 uose, about 1.5 cm. long; capsules oblong, gradually tapering to 

 a short neck, horizontal, pachydermous, reddish brown, lightly 

 constricted under mouth and subpendant when deoperculate ; urn 

 .8 mm. wide, 1.5 to 2 mm. long ; exothecial cells elliptical-oblong ; 

 exostomial teeth yellowish brown, strongly lamellate, confluent 

 into a reddish basal band ; endostomial band nearly one half the 

 length of the teeth; segments somewhat open, as long as the teeth ; 

 cilia 1 to 2, nodose-appendiculate ; annulus broad, of two rows 

 of cells, deciduous ; operculum conic, obliquely rostellate ; spores 

 .009 to .012 ; matures in spring. Grows on rocks. 



iwr Tdanri ■ tvne in Herbarium of New 



Vanco 



John Macoun, J 



and distributed as Heterocladium Vancouvcricnse Kindb., Can 

 Muse. 638. 



