OF WESTERN PENNSYLVANIA 351 



la. Eurynchium pulchellum variety robustum (Roell) New 



Combination. 



(E. strigositm var. robustum Roell ; Hypnum strigosuin Drum- 

 mond). 



(Plate LIII) 



Loosely matted or densely tufted, bright and shining 

 green: stems stoloniferous, creeping, with distant leaves; 

 secondary stems prostrate to erect, often curved, rather robust ; 

 leaves on the middle of the branches erect-spreading, lance- 

 ovate, scarcely decurrent, reaching about 1-1.2X0-4-0.5 mm., 

 acute to widely obtuse, plane-margined, sharply serrate above, 

 concave, scarcely plicate, costate to about two-thirds, the costa 

 usually ending in a dorsal spine ; median leaf-cells about 8-10:1, 

 linear to linear-rhomboid, the apical becoming rhomboid-ob- 

 long and about 2-3 :1, the basal somewhat shorter than the 

 median, the alar few, rectangular to quadrate or oval ; stem- 

 leaves decurrent, rather long-acuminate from an ovate to tri- 

 angular-ovate base, somewhat larger than the branch-leaves, 

 reaching about 1.3-1.5 mm. long, serrate nearly to the base, 

 costate to about two-thirds ; paraphyllia small, rounded-ovate ; 

 leaves on the stolons ecostate, triangular-ovate, small, acumi- 

 nate : seta castaneous, smooth, about 1-1.5 cm. long, drying 

 dextrorse above ; capsule yellowish-brown, oblong-ovate, about 

 2-3 :1, more or less dorsally turgid or sub-arcuate, drying 

 slightly constricted below the mouth, inclined or almost hori- 

 zontal, the urn about 2 mm. long ; annulus 2-3-seriate ; lid 

 convex, slenderly rostrate, about 1.5 mm. long; exothecial cells 

 rounded-quadrate at rim, oblong-hexagonal to rectangular 

 below, incrassate ; peristome-teeth hyaline and papillose at 

 apex, below dorsally cross-striolate, margined, plainly lamel- 

 late, strongly trabeculate, confluent at base ; segments narrow, 

 nearly as long as the teeth, carinately split between the nodes, 

 yellowish, the basal membrane about two-fifths as high ; cilia 

 3, slender, hyaline, nodose, usually one or two of them nearly 

 as long as the segments ; spores yellowish, incrassate, papil- 

 lose, about .012-014 mm., mature in autumn. 



The species occurs on gravelly or sandy soil, rocks, roots 

 of trees, etc., in open woods in Europe, Asia, northern Africa, 

 and from Arctic America to northern United States. The 

 variety robustum occurs in north central United States and 

 rather commonly in the northern portion of our region. 



Elk : McMinn. (Porter's Catalogue). 



McKean : Six pockets of specimens collected on the 



ground or on rocks in woods, near Brad- 

 ford, May 13, 1893, to September 29, 1896. 

 (Figured). D. A. B. 



