128 Best : Revision of the North American 



Although collected at several points on Vancouver Island it 

 does not appear to have been found elsewhere. In its general 

 appearance it resembles H. squarrosulum . It is, however, smaller 

 and the branch leaves alone suffice to distinguish one from the 

 other. 



Macoanii are found on the mountains 

 of England, Scotland, Belgium, Germany and probably in the 

 adjoining countries, and are usually referred to H. lieteropterum 

 (Bruch), from which they differ in being stouter, yellowish green 

 to golden-brown, branch leaves lanceolate, often secund, and leaf- 

 cells longer and narrower. As no capsules were found on the 



go us to H. 



H. Macounii 



ypU 



5. Heterocladium heteropterioides sp. nov. 



Plants quite small, in intricate spreading tufts, dark green. 

 Stems, without central strand, 3-6 cm. long, variously divided and 

 irregularly branched ; larger branches (secondary stems) ascend- 

 ing-erect, pinnate to bipinnate ; branchlets fasciculate, often tufted ; 

 leaves of primary stems erect-spreading, lower sometimes recurved 

 at tips, papillose, .25-35 mm - wide, .4-. 5 mm. long ; from a cor- 

 date, subdecurrent base, triangular to ovate-lanceolate, finely 

 pointed, margins plane, papillose-denticulate, costa thin, usually 

 short, rarely narrow and longer, reaching the middle ; leaves of 

 secondary stems appressed when dry, erect-spreading when moist, 

 cordate-triangular, acute to acuminate, margins papillose-serrulate ; 

 ultimate branch leaves ovate, acute to narrowly acuminate ; cells 

 of the basal-central area of stem leaves, not so clearly differentiated 

 as in the preceding species, oblong to sublinear, about .006 mm. 

 wide, 2-4 times as long, those of the basal margins quadrate, 

 passing into oval-oblong above, each cell with 2-5 small, bead- 

 like, irregularly distributed papillae on both surfaces ; apical cells 

 of ultimate branch leaves quadrate to oblong, crowned with 2-4 

 papillae. Dioicous ; perichetial bracts whitish, flexuose-spread- 

 ing, inner long and narrowly acuminate, margins denticulate; 

 pedicels smooth, flexuose-curved, about 1.5 cm. long; capsule 

 oval, horizontal, short-necked, pachydermous, contracted under 

 mouth when deoperculate ; urn 1.5 mm. long, .7 mm. wide; 

 exothecial cells thick-walled, oval to oblong ; annulus broad, of 

 2-1 rows of large cells, deciduous ; exostomial teeth yellowish, 

 strongly lamellate, confluent at base; endostomial band about 

 one half the length of the teeth ; segments slightly open ; cilia 



