Selaginella asprella

Maxon

Smithsonian Misc. Collect. 72: 6. 1920.

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

Plants on rock or terrestrial, forming cushionlike or loose mats. Stems decumbent to short-creeping, dry stem readily fragmenting, irregularly forking, without budlike arrested branches, tips straight; main-stem upperside and underside structurally slightly different, inconspicuously indeterminate, lateral branches radially symmetric, determinate or not, often strongly ascending on cushionlike mats, 1–2-forked. Rhizophores borne on upperside of stems, throughout stem length, 0.2–0.4 mm diam. Leaves monomorphic, in alternate pseudowhorls of 4, tightly appressed, ascending, green, narrowly triangular-lanceolate to linear-lanceolate, (2–) 2.5–4 × 0.45–0.7 (–0.8) mm (smaller on young buds); abaxial ridges present; base cuneate and decurrent or sometimes rounded and adnate on young buds, pubescent (hairs often covering 1/4 of leaf length abaxially); margins ciliate, cilia transparent to whitish, spreading, 0.7–0.15 mm; apex keeled, attenuate or obtuse, bristled; bristle white or transparent, puberulent, 0.5–1.4 mm. Strobili solitary, 0.4–1.5 (–2) cm; sporophylls lanceolate and strongly tapering to apex or deltate-ovate to ovatelanceolate, abaxial ridges moderately defined, base pubescent or glabrous, margins short-ciliate to dentate, apex keeled or plane, bristled.


Habitat: Limestone ridges, dry rocky slopes, igneous rock, exposed cliffs or gravelly soil
Elevation: 900–2700 m

Distribution

V2 719-distribution-map.gif

Calif., Mexico in Baja California

Discussion

Selaginella asprella may be confused with S. leucobryoides particularly because of its readily fragmenting stems.

Of conservation concern.

Selected References

None.

Lower Taxa

None.

... more about "Selaginella asprella"
deltate-ovate;ovatelanceolate +
Bristled (?) +, Plane (?) +, Keeled (?) +, Obtuse (?) +  and Attenuate (?) +
Iván A. Valdespino +
glabrous +  and pubescent +
rounded +, decurrent +  and cuneate +
transparent;white +
0.05 cm0.5 mm <br />5.0e-4 m <br /> (0.14 cm1.4 mm <br />0.0014 m <br />) +
transparent +  and whitish +
0.07 cm0.7 mm <br />7.0e-4 m <br /> (0.015 cm0.15 mm <br />1.5e-4 m <br />) +
Bluish spike-moss +
Calif. +  and Mexico in Baja California +
900–2700 m +
Limestone ridges, dry rocky slopes, igneous rock, exposed cliffs or gravelly soil +
not +  and determinate +
monomorphic +
0.2 cm2 mm <br />0.002 m <br /> (0.25 cm2.5 mm <br />0.0025 m <br />) +
0.07 cm0.7 mm <br />7.0e-4 m <br /> (0.08 cm0.8 mm <br />8.0e-4 m <br />) +
2.5mm;4mm +
fertile +  and vegetative +
narrowly triangular-lanceolate;linear-lanceolate +
0.045 cm0.45 mm <br />4.5e-4 m <br /> (0.07 cm0.7 mm <br />7.0e-4 m <br />) +
ciliate +  and serrate +
short-ciliate to dentate +
cushionlike +
globose +, ovoid +  and tetrahedral +
tetrahedral +
Smithsonian Misc. Collect. +
alternating +
0.02 cm0.2 mm <br />2.0e-4 m <br /> (0.04 cm0.4 mm <br />4.0e-4 m <br />) +
adjacently +  and monomorphic +
fertile +  and vegetative +
branched +, not +  and articulate +
dimorphic +, climbing +  and cespitose +
decumbent;short-creeping +
1.5 cm15 mm <br />0.015 m <br /> (2 cm20 mm <br />0.02 m <br />) +
quadrangular +
0.4 cm4 mm <br />0.004 m <br /> (1.5 cm15 mm <br />0.015 m <br />) +
Selaginella asprella +
Selaginella subg. Tetragonostachys +
species +
straight +
branched +  and not articulate +
erect +  and creeping +
branched +  and not articulate +
erect +  and creeping +
differentiated +
perennial +  and annual +
epiphytic +  and hemiepiphytic +
12 +, 11 +, 10 +, 9 +, 8 +  and 7 +