Selaginella bigelovii

L. Underwood

Bull. Torrey Bot. Club 25: 130. 1898.

Common names: Bigelow's spike-moss bushy spike-moss
Treatment appears in FNA Volume 2.

Plants on rock or terrestrial, forming clumps. Stems radially symmetric, underground (rhizomatous) and aerial, not readily fragmenting, irregularly forked; rhizomatous and aerial stems often with 1 branch arrested, budlike, tips straight; aerial stems erect or occasionally ascending. Rhizophores borne on upperside of stems, restricted to rhizomes and lower 1/3 of aerial stems, 0.3–0.4 mm diam. Leaves dimorphic, not clearly ranked. Rhizomatous stem-leaves persistent, tightly appressed, scalelike. Aerial stem-leaves appressed, ascending, green, linear-lanceolate to narrowly lanceolate, 2.2–3.8 × 0.29–0.4 (–0.75) mm; abaxial ridges present; base abruptly adnate, cordate to almost peltate, pubescent or sometimes glabrous; margins short-ciliate at base, denticulate toward apex, cilia white to transparent or greenish, spreading at base, ascending toward apex, 0.02–0.08 mm; apex keeled, bristled; bristle puberulent, rough, transparent to whitish, 0.23–0.75 mm. Strobili solitary, (0.4–) 1–1.5 cm; sporophylls ovatelanceolate to lanceolate, abaxial ridges not prominent, base glabrous, margins short-ciliate to denticulate, apex bristled. 2n = 18.


Habitat: Exposed rock crevices, cliffs, boulders, sandstone or igneous rock, serpentine, or gravelly soil
Elevation: 0–2000 m

Distribution

V2 67-distribution-map.gif

Calif., Mexico in Baja California

Discussion

Selaginella bigelovii is a member of the series Arenicolae (R. M. Tryon 1955) and is closely related to S. rupincola (see discussion). It may be confused with S. × neomexicana. Selaginella bigelovii, however, always has well-developed megasporangia with most of the megaspores and microspores well formed, whereas S. × neomexicana is a presumed sterile hybrid that does not form megaspores, seldom forms microspores, and usually has most sporangia misshapen (R. M. Tryon 1955). Moreover, S. × neomexicana has not been reported from either California or Baja California.

Selected References

None.

Lower Taxa

None.

"thick" is not a number.

... more about "Selaginella bigelovii"
Bristled (?) +  and Keeled (?) +
Iván A. Valdespino +
L. Underwood +
glabrous +  and pubescent +
cordate +
transparent;whitish +
0.023 cm0.23 mm <br />2.3e-4 m <br /> (0.075 cm0.75 mm <br />7.5e-4 m <br />) +
white +  and transparent or greenish +
0.002 cm0.02 mm <br />2.0e-5 m <br /> (0.008 cm0.08 mm <br />8.0e-5 m <br />) +
Bigelow's spike-moss +  and bushy spike-moss +
Calif. +  and Mexico in Baja California +
0–2000 m +
Exposed rock crevices, cliffs, boulders, sandstone or igneous rock, serpentine, or gravelly soil +
monomorphic +
fertile +  and vegetative +
linear-lanceolate;linear +
ciliate +  and serrate +
short-ciliate;denticulate +
globose +, ovoid +  and tetrahedral +
tetrahedral +
Bull. Torrey Bot. Club +
alternating +
0.03 cm0.3 mm <br />3.0e-4 m <br /> (0.04 cm0.4 mm <br />4.0e-4 m <br />) +
adjacently +  and monomorphic +
fertile +  and vegetative +
0.04 cm0.4 mm <br />4.0e-4 m <br /> (0.075 cm0.75 mm <br />7.5e-4 m <br />) +
2.2mm;3.8mm +
linear-lanceolate +  and narrowly lanceolate +
0.29mm;0.4mm +
rhizomatous +
budlike +  and symmetric +
dimorphic +, climbing +  and cespitose +
decumbent;creeping;prostrate +
aerial +  and underground +
ascending;erect +
0.4 cm4 mm <br />0.004 m <br /> (1 cm10 mm <br />0.01 m <br />) +
quadrangular +
1 cm10 mm <br />0.01 m <br /> (1.5 cm15 mm <br />0.015 m <br />) +
Selaginella bigelovii +
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 +