4T4 Best: REVISION OF THE 
line zigzag, ventral surface lamellate ; endostomial band adherent 
to the columella, narrow, about one fourth the length of the teeth ; 
segments irregular, unequal, sometimes rudimentary ; annulus of 
two rows of cells, deciduous in pieces ; operculum conic, obliquely 
short-beaked ; calyptra cucullate, reaching the base of capsule ; 
spores roughened, 12-15 4, mature insummer. About the base of 
trees, rarely on rotten wood or stones. (PLATE 16, Fics. 41-54.) 
TyPE LOCALITY: Germany. 
DistriputTion: From Labrador to British Columbia, south- 
ward to Pennsylvania (Burnett) and Colorado (Holzinger). Usually 
sterile in the United States; fruiting in Smuggler’s Notch, Ver- 
mont (Mrs. Britton); frequently fertile in British America 
(Macoun). 
ExsiccataE: Austin, Musc. Appalach. 277 ; Macoun, Canad. 
Muse, 252. 
As with all widely distributed species, L. nervosa is somewhat 
variable. Depauperate growths with flagelliform branchlets and 
rudimentary leaves are common. Small heads or spikes of bulbils 
(gemmae), usually borne on the distal ends of stems and branches, 
are present in most specimens whether fruiting or not. L. dulbifera 
Brid. is a sterile form with bulbils. In the absence of other dis- 
tinguishing characters, Bridel’s species seems scarcely worthy of 
varietal rank, much less specific. Brownish septate brood-bodies 
(propagula) are occasionally found on the leaves of this species. 
g. Leskea nervosa nigrescens (Kindb.). 
Leskea nigrescens Kindb. Bull. Torrey Club, 16: 97. 1 889. 
Leskea nervosa var. flagellifera Kindb. Ottawa Nat. 4: 62. 
1890. 
Anomodon heteroideus Kindb.; Macoun, Cat. Can, P. 6: 62. 
1890; Eur. & N. Am. Bry. 12. 1896. 
In intricate tufts or mats, dirty yellowish green to dark green 
or black; stems 2-3 cm. long, creeping, scarcely radiculose, 
defoliate or with distant ovate narrowly acuminate recurved leaves, 
irregularly branched ; branches usually few, short, ascending with 
numerous flagelliform branchlets, commonly bearing bulbils at 
their tips: branch-leaves as in type but smaller, 0.2-0.3 mm. 
wide, 0.4-0.6 mm. long; leaf-cells quadrate-hexagonal, smooth 
or slightly papillose, 6-8 » wide ; leaves of branchlets rudimentary, 
scarcely costate: sterile. On the base of trees, sometimes OD 
stones and rocks ; with the type but less common ; Canad. Musc.. 
395. 
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