|
BFNA Title: Pterigynandrum |
|
Edit
Level R Brum+ PTERIGYNANDRUM XXX.
PTERIGYNANDRUM Hedwig, Spec. Musc. Frond., 80. 1801 * [Alluding to the lateral position of
male and female inflorescences] Dale H. Vitt Plants slender, green to yellow-green. Stems
freely and irregularly branched, forming pendent to prostrate, smooth mats;
paraphyllia none or rare. Leaves erect to homomallous, somewhat
concave, closely spaced, oblong-elliptic, blunt to acute; margins reflexed
proximally, serrulate distally; costa short and double; laminal cells oblong-rhombic,
generally thick-walled, prorulose abaxially; alar cells small and
subquadrate. Sexual condition dioicous.
Sporophytes not
common. Capsules erect, cylindric, smooth; peristome double, short. Calyptra
cucullate. Species 1 (1
in the flora): North America, Europe, Asia, 1. Pterigynandrum filiforme Hedwig, Spec. Musc. Frond., 81. 1801 Stem leaves imbricate, erect, somewhat falcate to
homomallous, 0.6--1 mm, oblong-elliptic; margins narrowly reflexed below,
erect and serrulate above; distal laminal cells oblong to rhombic, curved,
abaxially prorulose. Seta 5--15 mm. Capsule 1--2.5 mm, symmetric; urn cylindric, erect; peristome
diplolepidous, exostome teeth 16, short, lanceolate, endostome of 16 stout
linear segments; calyptra cucullate. Spores 11--13 µm. Mesic, acidic
boulders and rock shelves in the western montane forests and on acidic rocks
throughout the eastern Canadian shield country; Greenland; Alta., B.C., N.B.,
Nfld., N.W.T., N.S., Ont., P.E.I., Que., Yukon; Alaska, Calif., Colo., Idaho,
Maine, Mass., Mich., Minn., Mont., N.H., N.Y., N.C., Oreg., Penn., S.D.,
Tenn., Vt., Va., Wash., W.Va., Wis., Wyo.; Europe; West Indies; Central
America; Asia. The slender,
sleek, braided stems trailing down the sides of acid rocks are characteristic
of Pterigynandrum filiforme. The somewhat curved, ovate, rather blunt
leaves; and rhombic, coarsely prorulose leaf cells are additional identifying
features. |
