—30 — 
“ P. decipiens Limpr. 
“ The lamellae of the leaves when seen from the side have a crenulate 
margin, not or only slightly thickened, and not papillose, and all the cells are 
nearly equally large ; the marginal cells of the lamellae in cross section are 
usually unlike each other, but for the most part slightly emarginate. On 
the back of the leaf the cells are for the most part transversely arranged. 
The cells of the sheath of the leaves are longer and narrower.” 
In the same paper Prof. Lindberg describes 
“ POLYTRICHUM ANGUSTIDENS n. Sp. 
“Plant 4 cm. high, brown- green, stout, simple or usually branched, 
densely leafed, not radiculose. Leaves when dry twisted, recurved or erect- 
open, when moist lower leaves erect-open, upper leaves recurved slightly; 
the lamina io mm. long, at the base about. 7 mm. wide, gradually narrowed 
into a short brown sharp and denticulate point : leaf base sheathing, 1.8 mm. 
wide, somewhat shining when dry. Leaves in cross-section obtusely keeled, 
the costa on the back somewhat prominent, occupying nearly the entire 
lamina, with a thick dorsal bundle of stereid cells across the leaf, the ventral 
bundle less developed and interrupted, the dorsal cells rather large with 
their outer walls thickened. Lamellae about 46, .07 to .1 mm. high, closely 
crowded, erect, built up of one layer of cells (4-6 deep), greatly thickened on 
the margin, which is plane, not crenulate, but lengthwise striolate, the rhar- 
ginal cells in cross section not or little larger than the rest, otherwise similar 
to them; convex above, papillose, the greatly thickened walls crescent- 
shaped. Seta straight, stiff, 56 mm. thick, purple, about 50 mm. long. Cap- 
sule oblique, microstome much larger at base, 5.7 mm. long, at base 2.3 mm. 
in diameter, at the mouth only 1.5 mm., sharply quadrangular, with a very 
distinct hypophysis having stomata, with cells of exothecium haxagonal and 
grooved. Operculum conic, 2.2 mm. long, obliquely long-rostrate. Basilar 
membrane of peristome .1 mm. high, teeth 64, narrow, sharp pointed, pale, 
papillose, .2 mm. high and about .035 mm. wide. Spores green, very smooth, 
pellucid, 8.8-ir/^ in diameter. 
“ This is a very fine new species very well marked by the characters 
above set forth.” 
Type station near Hope, Kootanai Co., Idaho, collected by Dr. J. H. 
Sandberg in August, 1892. (No. 1121, in Contributions U. S. National Herb., 
Vol. Ill, No. 4, p. 272, as P. attenuatum Menz.) Type in the Nat. Herb., 
Washington, D. C.,,as No. 1121 of Dr. Sandberg's collection. A duplicate 
of this plant has been sent by the writer to Dr. V. F. Brotherus as P.for- 
' mo sum Hedw, (old No. 137, new No. 1121). And this is the plant described 
above. 
It seems best to publish with this note Prof. Lindberg’s plate elucidating 
the differences between the several species of Polytrichum referred to. 
Fig. 1. Polytrichinn Ohioense R. & C., Lake Michigan, leg. Lapham 
(Herb. Cardot). 
Fig. 2. P. Ohioense R & C., New Jersey, Hoboken, leg. P. T. Cleve. 
