|
|
|
Polytrichastrum formosum (Hedwig) G. L. Smith, Mem. New York Bot. Gard. 21(3): 37. 1971.
Polytrichum attenuatum Menzies ex BridelPolytrichum formosum Hedwig
Plants medium and slender to large and robust, green to dark olive-green to blackish, in loose tufts. Stems (2--)3--8(--20) cm, mostly unbranched. Leaves 6--8(--12) mm, erect to erect-spreading when dry, spreading to subsquarrose and broadly recurved when moist; sheath ovate to elliptic, yellowish, hyaline-margined, gradually tapering or abruptly contracted to the blade, the cells at the shoulders forming a differentiated hinge; blade lanceolate to linear; costa prominent abaxially and toothed near the tip; excurrent as a short, toothed point; marginal lamina erect, (2--)3--5(--10) cells wide, plane or erect, sharply toothed from apex nearly to the sheath; lamellae (3--)4--5(--7) cells high, margins ± entire to finely serrulate in profile, the marginal cells in section rounded to narrowly elliptic and somewhat taller than the cells beneath, the cell walls not or moderately thickened; median cells of sheath 8--12 µm wide, narrowly rectangular, 5--7(--10):1; cells of marginal lamina subquadrate, 10--15 µm. Sexual condition dioicous or polygamous; perichaetial leaves similar to the foliage leaves, or somewhat longer, with a longer sheath. Seta 3--6 cm, yellowish to reddish brown. Capsule 4--7 mm, rather slender or short rectangular, acutely 4(--6)-angled, inclined to almost horizontal, pale yellowish brown to brownish; hypophysis cylindric, indistinctly delimited or set off by a shallow groove; exothecium smooth or the cells weakly convex, quadrate to hexagonal, without a central thin spot; peristome 600 µm, divided to 0.6, the teeth 64 and highly regular in form or fewer and somewhat irregular, pale to brownish; epiphragm lacking marginal teeth. Spores 12--16 µm.
|
|
|
|
| 1 |
Plants often robust, 5--10(--20) cm; leaves subsquarrose and broadly spreading- recurved when moist; lamellae 5--7 cells high, entire, the marginal cells in section rounded, moderately thick-walled; capsule short rectangular; hypophysis delimited by a shallow groove; peristome teeth 64, regular in form; dioicous. |
|
Polytrichastrum formosum var. formosum |
| + |
Plants rather slender, 3--6(--10) cm; leaves spreading when moist; lamellae (3--)4--6 cells high, the marginal cells narrowly elliptic, not or only slightly thickened; capsule slender; hypophysis not sharply delimited; peristome teeth 50--64, somewhat irregular in size and shape; monoicous. |
|
Polytrichastrum formosum var. densifolium |
|
|
|
Lower Taxa
Related Synonym(s):
| Related Links (opens in a new window) |
|
Treatments in Other Floras @ www.efloras.org
Other Databases
|
|
|
|
|
|
|
|
|
