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FNA | Family List | FNA Vol. 28 | Orthotrichaceae | Zygodon

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

Bryum viridissimum Dickson, Fasc. Pl. Crypt. Brit. 4: 9, plate 10, fig. 18. 1801

Plants to 2.3 cm. Stem leaves loosely erect and ± spirally twisted to somewhat contorted, sometimes falcate-secund at stem apices when dry, erect-spreading to spreading when moist, lanceolate, narrowly so, elongate-lanceolate, oblong-lanceolate, or linear-lanceolate, 1-2 mm; margins entire or irregularly serrulate or serrate near apex, somewhat wavy; apex acute with gradual apiculus, apiculate, short-apiculate, or short-acuminate; costa ending below apex, abaxial surface covered by quadrate papillose cells distally; basal laminal cells subquadrate to rectangular; distal cells 7-11 µm, papillae 2-4 per cell, walls somewhat thick. Specialized asexual reproduction by clavate, elliptic, or subcylindric gemmae, longitudinal walls present or absent. Sexual condition dioicous. Sporophytes unknown.

Varieties 5 (3 in the flora): North America, Mexico, Central America, Europe, w Asia, Africa, Atlantic Islands (Canary Islands).

Zygodon viridissimus in the flora area includes phenotypes with ovate to elliptic gemmae; narrowly lanceolate, loosely erect leaves; the abaxial surface of the distal 1/3-1/2 of the costa covered with papillose, quadrate cells; dioicous sexual condition; and rudimentary (or no) peristome.

1 Leaf margins serrulate at apex.   5b Zygodon viridissimus var. dentatus
+ Leaf margins entire   (2)
2 (1) Gemmae with longitudinal septa present; leaves oblong-lanceolate to lanceolate.   5a Zygodon viridissimus var. viridissimus
+ Gemmae with longitudinal septa absent; leaves linear- to elongate-lanceolate.   5c Zygodon viridissimus var. rupestris


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