Selaginella leucobryoides

Maxon

Smithsonian Misc. Collect. 75: 8. 1920.

Common names: Mojave spike-moss
Endemic
Treatment appears in FNA Volume 2.

Plants on rock, forming rounded cushionlike mats. Stems decumbent to short-creeping, dry stems readily fragmenting; irregularly forked, without budlike arrested branches, tips straight; main-stem upperside and underside structurally slightly different, inconspicuously indeterminate, lateral branches radially symmetric, determinate, strongly ascending, 1-forked. Rhizophores borne on upperside of stems, throughout stem length, 0.2–0.35 mm diam. Leaves monomorphic, ± in alternate pseudowhorls of 4, tightly appressed, ascending, green, linear-oblong to linear-lanceolate, sometimes falcate on lateral rows (on main-stem), 2–4.5 × 0.5–0.65 mm (usually smaller on young ascending branches); abaxial ridges present; base cuneate and decurrent (rounded and adnate on young branches), glabrous; margins short-ciliate, cilia transparent, scattered, spreading at base to ascending and dentiform toward apex, 0.07–0.15 mm; apex slightly attenuate and bristled or obtuse and abruptly bristled; bristle whitish or transparent, puberulent, 0.2–0.6 mm. Strobili solitary, 0.4–1.5 cm; sporophylls deltate-ovate or lanceolate, abaxial ridges moderately defined, base glabrous, margins short-ciliate to denticulate, apex acuminate with very short bristle.


Habitat: In rock crevices or on exposed rock
Elevation: 800–2800 m

Discussion

Selaginella leucobryoides has very tightly intertwined stems that readily fragment, a characteristic shared with S. utahensis and S. asprella. Selaginella leucobryoides is very closely related to, and difficult to separate from, S. utahensis (see discussion).

Selected References

None.

Lower Taxa

None.

... more about "Selaginella leucobryoides"
Acuminate (?) +, Bristled (?) +, Obtuse (?) +  and Attenuate (?) +
Iván A. Valdespino +
decurrent +  and cuneate +
transparent;whitish +
0.02 cm0.2 mm <br />2.0e-4 m <br /> (0.06 cm0.6 mm <br />6.0e-4 m <br />) +
transparent +
Mojave spike-moss +
Ariz. +, Calif. +  and Nev. +
800–2800 m +
In rock crevices or on exposed rock +
monomorphic +
2mm;4.5mm +
fertile +  and vegetative +
falcate;linear-oblong;linear-lanceolate +
0.05 cm0.5 mm <br />5.0e-4 m <br /> (0.065 cm0.65 mm <br />6.5e-4 m <br />) +
ciliate +  and serrate +
short-ciliate;denticulate +
cushionlike +  and rounded +
globose +, ovoid +  and tetrahedral +
tetrahedral +
Smithsonian Misc. Collect. +
alternating +
0.02 cm0.2 mm <br />2.0e-4 m <br /> (0.035 cm0.35 mm <br />3.5e-4 m <br />) +
adjacently +  and monomorphic +
fertile +  and vegetative +
branched +, not +  and articulate +
dimorphic +, climbing +  and cespitose +
decumbent;short-creeping +
quadrangular +
0.4 cm4 mm <br />0.004 m <br /> (1.5 cm15 mm <br />0.015 m <br />) +
Selaginella leucobryoides +
Selaginella subg. Tetragonostachys +
species +
straight +
branched +  and not articulate +
erect +  and creeping +
branched +  and not articulate +
erect +  and creeping +
differentiated +
0.007 cm0.07 mm <br />7.0e-5 m <br /> (0.015 cm0.15 mm <br />1.5e-4 m <br />) +
perennial +  and annual +
epiphytic +  and hemiepiphytic +
12 +, 11 +, 10 +, 9 +, 8 +  and 7 +