248 A MANUAL OF MOSSES 



basal membrane, no segments, no cilia; lid conic-obtuse; 

 calyptra cucullate; spores .025-030 mm. 



As here limited the genus consists of 6 species, occurring 

 on tree-trunks in the Northern Hemisphere; two species in 

 North America; one species in our region. 



1. Lrindbergia austini (Sullivant) Brotherus. 



(Fabroleskea austim Grout; Leskea austini Sullivant). 



Medium size, intricately matted ; stems irregularly divided, 

 the branches usually quite unequal ; leaves spreading to more 

 or less squarrose when moistened, imbricate when dry, ovate, 

 long and slenderly acuminate, strongly papillose, entire ; costa 

 ending above the middle ; leaf-cells unipapillate, elliptic-rhom- 

 boid above, the basal marginal thick, rounded-quadrate ; peri- 

 chaetial leaves longer, lance-acuminate: seta short, erect; capsule 

 erect, oval-cylindric with a small mouth ; teeth broadly lanceo- 

 late, deeply inserted, opaque, papillose on both surfaces, the 

 inner peristome consisting merely of a low basal membrane 

 scarcely exceeding the rim of the urn ; annulus none ; lid short- 

 conic ; spores mature in summer. 



On tree-trunks and on rocks or stone- walls'; northeastern 

 United States from New Jersey to Minnesota and Kansas. In 

 Porter's Catalogue the habitat is given as Juniperns virginianus. 

 Not yet collected in our region. 



6. LESKEA Hedwig. 



Autoicous : rather slender, usually weak, loosely cespitose, 

 dull, dark to sooty-green: stems creeping, sparsely radiculose, 

 rather thickly-leaved, more or less pinnately branched, with 

 short, erect or ascending branches ; leaves when dry imbricate, 

 when moist erect-spreading to spreading, sometimes sub- 

 secund, from a somewhat decurrent, cordate-ovate base nar- 

 rowed to an acute or obtuse apex, sometimes apiculate, short- 

 ly two-plicate, revolute on one or both lower margins, rarely 

 indistinctly serrate at apex; costa strong, incomplete; median 

 leaf-cells either thin-walled, rounded-hexagonal, one- to sev- 

 eral-papillose, at the base almost quadrate, in the middle rhom- 

 boidal, or more or less thickened, with oval to oblong acumen ; 

 branch-leaves smaller ; inner perichsetial leaves pale, sheathing, 

 abruptly to slenderly acuminate, entire or serrulate, at the apex, 

 delicately and incompletely costate: seta long, thin, red,, 

 smooth ; capsule erect, oblong-cylindric. sometimes slightly 

 curved and weakly inclined, yellowish, finally light brown and 

 plicate; annulus revoluble; teeth drying strongly incurved, 

 linear, acuminate, entirely separate, non-bordered, pale yellow, 

 at the base transversely dorsally striate, thickly trabeculate, 

 papillose above; inner peristome papillose, basal membrane 



