-98 - 



surface, usually smooth on upper alar ; cells quadrate, in 5 or 6 rows ; median 

 oval-rhombic to oblong-fusiform, 8-9 pi wide, about twice as long; branch- 

 leaves broadly lanceolate, scarcely secund, 0.25-0.35 mm. wide, o .5-0.7 mm. 

 long; monoicous ; perichetial bracts appressed, plicate, costate, long and 

 narrowly acuminate, entire or serrulate above; pedicel 1.5 cm. long, grooved, 

 twisted to the left below, to the right above, curved, reddish; capsule oblong- 

 cylindric, curved, tapering at base, wrinkled when dry; urn about 2 mm. 

 long, 0.6 mm. wide; exothecial cells oblong-linear, thick-walled; annulus 

 broad, 2-3 rows of cells; teeth lanceolate-linear, o 6-0.7 rnm. long, 0.03 mm. 

 wide, yellowish below, pale above, densely papillose, divisural line faint, 

 ventral surface strongly lamellate: endostomial band yellowish, papillose, 

 about one-seventh the length of the teeth; segments as long as the teeth, 

 split, scarcely open on the keel: cilia rudimentary; operculum whitish, sub- 

 shining, narrowly conic, about one-half as long as the urn: calyptra cucul- 

 late; spores smooth, 10-13 mature in early.summer. On the base of trees, 

 rarely on decaying wood, in sandy places. (Plate 15, Figs, 1-13.) 



TvPE Locality: Delaware; collected by Mr, A. Commons, June 9, 

 1894; type in the New York Botanical Garden. 



Distribution: From Maine southward along the coast to Virginia and 

 northward and westward to Minnesota and Dakota. Maine (Merrill)"; New 

 York(Maxon, Grout); New Jersey (Best); Delaware (Commons); Maryland 

 (Smith, Holzinger) ; Virginia (Vail and Britton); Ohio (Lesquereux) ; North 

 Dakota (Holzinger) ; Minnesota (Holzinger). 



Exsiccatae: S. & L. Muse, Bor. Am. 243 and 365 as L. obscura\ Ren. 

 & Card. Muse. Am. Sept. 192b as L. polycarpa forma. 



My first acquaintance with L. arenicola was in 1892 while collecting in 

 the New Jersey pine-barrens. Recognizing its distinctness as a species 

 specimens of it were distributed under this name. Subsequently, however, 

 while examining the collection of the New York Botanical Garden, the same 

 species was found under the name of L. Donnellii. having been collected in 

 Maryland by Mr. J. Donnell Smith and so named by Austin. The type 

 being in a poor condition, with only fragments of peristomes and no oper- 

 cula, it was thought best to discard Austin's manuscript name and use a 

 type as w^ell as a new name. 



L. are7iicola is readily distinguished from all other species of Euleskea 

 by its curved capsules, longer teeth and segments, longer and narrower 

 opercula and by its rhombic, elongated leaf-cells. In its general appear- 

 ance it resembles some forms of L. polycarpa paludosa, from which 

 it is however easily separated by the character just named. When 

 once understood it will probably be found more common than here indicated. 

 (3) Leskea nervosa nigrescens (Kindb.) Best. 



Leskea nigrescens Kindb. Bull. Torrey Club, 16: 97. 1889. 



Leskea nervosa flag el lifer a Kindb. Ottawa Nat. 4: 62. 1890. 



Anoinodon heteroideiis 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 



