Hygrohypnum alpestre

(Hedwig) Loeske

Verh. Bot. Vereins Prov. Brandenburg 46: 198. 1905.

Basionym: Hypnum alpestre Hedwig Sp. Musc. Frond., 247, plate 64, figs. 1–4. 1801
Synonyms: Calliergon alpestre (Hedwig) Kindberg Ochyraea alpestris (Hedwig) Ignatov & Ignatova
Treatment appears in FNA Volume 28. Treatment on page 271. Mentioned on page 272.

Plants soft, yellow or yellow-green, with or without rusty mottling distally, older extremities dirty or reddish-brown to reddish black. Stems to 9 cm, leafy throughout, often denuded basally, irregularly branched; hyalodermis absent, epidermal-cells small, walls thick, similar to subadjacent cortical cells, central stand strong. Leaves usually tumid-julaceous, sometimes spreading, straight, never falcate, usually little changed when dry or moist, oblong to oblong-lanceolate, deeply concave, almost boatshaped in apex, (0.9–) 1.4–1.6 (–1.9) × (0.4–) 0.6–0.7 (–0.9) mm; margins narrowly recurved especially in distal 1/3 and apex, entire to uneven in apex; apex acute to slightly obtuse, becoming reflexed as squarrose apiculus; costa double and long with one arm reaching mid leaf, single to mid leaf or beyond, or double and short; alar cells quadrate, short-rectangular, or rectangular, region clearly differentiated; basal laminal cells shorter, wider, walls more incrassate; medial cells uniformly long linear-flexuose, (55–) 65–90 (–105) µm; apical cells usually shorter; marginal cells rarely longer than 55 µm. Sexual condition autoicous; perichaetial inner leaves lanceolate to linear-lanceolate, plicate, margins entire or sometimes toothed toward apex, ecostate, costa single, or double, slender, to mid leaf. Seta reddish, 0.7–1.6 cm. Capsule with endostome cilia (2 or) 3.


Habitat: Irrigated, emergent acidic rock in montane and northern streams
Elevation: moderate elevations (700-1400 m)

Distribution

V28 423-distribution-map.gif

Greenland, B.C., Man., Nfld. and Labr., Nunavut, Ont., Alaska, Europe (Russia), Europe (Scandinavia)

Discussion

Hygrohypnum alpestre is most easily recognized by the narrowly recurved, squarrose leaf apiculus, best seen in stem and branch apices. Also distinctive is the depth of the leaf concavity, with the apex like that of boat bow. The same concavity gives the leaves a tumid-julaceous appearance on the stems or branches. Also, the alar region of quadrate, short-rectangular to rectangular cells is well developed. The plants grow in easily fragmenting patches. The leaves are usually closely spaced with enlarged, often excavated, thick-walled alar cells and slightly lengthened laminal cells in the acute apices; older leaves may be eroded at the apex.

Selected References

None.

Lower Taxa

None.

"narrower" is not a number.

... more about "Hygrohypnum alpestre"
not differentiated +
not +  and separating +
acute +  and slightly obtuse +
moist +  and dry +
David W. Jamieson +
(Hedwig) Loeske +
decurrent +
Hypnum alpestre +
cucullate +
curved +  and straight +
inclined +  and erect +
ovoid +  and oblong-cylindric +
bright red +, reddish-brown +, brown +, yellowbrown +  and hyaline +
little +  and undifferentiated +
rectangular +, short-rectangular +  and quadrate +
enlarged +
differentiated +
appendiculate +
slender +
Greenland +, B.C. +, Man. +, Nfld. and Labr. +, Nunavut +, Ont. +, Alaska +, Europe (Russia) +  and Europe (Scandinavia) +
moderate elevations (700-1400 m) +
brownish +  and yellowbrown +
short +  and narrow +
Irrigated, emergent acidic rock in montane and northern streams +
falcate-secund +
0.16 cm1.6 mm <br />0.0016 m <br /> (0.19 cm1.9 mm <br />0.0019 m <br />) +
0.07 cm0.7 mm <br />7.0e-4 m <br /> (0.09 cm0.9 mm <br />9.0e-4 m <br />) +
straight +
0.14 cm1.4 mm <br />0.0014 m <br /> (0.16 cm1.6 mm <br />0.0016 m <br />) +
falcate +
1 cm10 mm <br />0.01 m <br /> (?) +
0.06 cm0.6 mm <br />6.0e-4 m <br /> (0.07 cm0.7 mm <br />7.0e-4 m <br />) +
autoicous +  and sexual +
linear-flexuose +
multistratose +  and 1-stratose +
fusiform +  and short-rhombic +
short-rostrate +, rostrate +  and conic +
obovate +, oblong +, ovate +  and lanceolate +
Verh. Bot. Vereins Prov. Brandenburg +
large +  and small +
differentiated +
warty-papillose +  and smooth +
warty-papillose +  and smooth +
0.7 cm7 mm <br />0.007 m <br /> (1.6 cm16 mm <br />0.016 m <br />) +
branched +  and leafy +
0 cm0 mm <br />0 m <br /> (9 cm90 mm <br />0.09 m <br />) +
Calliergon alpestre +  and Ochyraea alpestris +
Hygrohypnum alpestre +
Hygrohypnum +
species +
incrassate +
reddish-brown +  and reddish black +
small +  and large +
transitional +