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BFNA | Family List | BFNA Vol. 2 | Orthotrichaceae | Zygodon

Zygodon viridissimus (Dickson) Bridel, Bryol. Univ. 1: 592. 1826.

  • Bryum viridissimum Dickson

    Plants to 2.3 cm. Stem leaves loosely-erect and ± spirally twisted to somewhat contorted, sometimes falcate-secund in distal portions of stems when dry, erect-spreading to spreading when moist, oblong-lanceolate, lanceolate, or linear-lanceolate, 0.5--2 mm, acute, with gradual, 1--few celled apiculus, ± keeled below, decurrent; margins entire or with sharp, irregular teeth near apex, somewhat wavy; costa ending below apex with abaxial side covered with quadrate papillose cells only at apex; distal laminal cells 7--11 µm wide, with 2--4 clavate papillae, somewhat thick-walled; basal laminal cells pale-yellow, subquadrate to rectangular; gemmae clavate to elliptic. Sexual condition dioicous. Spores 11--15 µm.

    Varieties at least 5 (4 in the flora); high elevations; widely scattered in the flora area, from Alberta. and Quebec south to Massachusetts and California; North and Central America; Europe; w Asia; Africa; Atlantic Islands (the Canaries).

    Zygodon viridissimus in the flora includes Northern Hemisphere Zygodon phenotypes with (1) ovate to elliptic gemmae, (2) narrowly lanceolate, loosely erect leaves, (3) the abaxial surface of the costae in the distal 1/3--1/2 of the leaf covered with papillose, quadrate cells, (4) dioicous sexual conditions, and (5) rudimentary (or no) peristome. The species is generally found on tree trunks and in crevices on vertical rock faces, usually at high elevations (up to 4000 m in western N. America).

    1 Leaves serrulate at apex.   (2)
    + Leaves entire.   (3)
    2 (1) Gemmae without curved longitudinal septae; plants less than or equal to 5 mm.   Zygodon viridissimus var. A
    + Gemmae with curved longitudinal septae; plants greater than or equal to 5 mm.   Zygodon viridissimus var. dentatus
    3 (1) Gemmae with longitudinal septae; leaves oblong-lanceolate to lanceolate.   Zygodon viridissimus var. viridissimus
    + Gemmae without longitudinal septae; leaves lanceolate to linear-lanceolate.   Zygodon viridissimus var. rupestris

    Lower Taxa

    Related Synonym(s):


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    Flora of North America  
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