Fissidens pauperculus

Howe

Erythea 2: 97, fig. 1. 1894,.

Treatment appears in FNA Volume 27. Treatment on page 354. Mentioned on page 335.

Plants 2–3 × 1.5–2.5 mm. Stems unbranched; axillary hyaline nodules absent; central strands weak. Leaves as many as 5 pairs, oblong to oblanceolate to lanceolate, acute to short-acuminate, to 2.1 × 0.6 mm; margin crenulate-serrulate but often sharply serrate on distal parts of vaginant laminae, elimbate; dorsal lamina usually narrowed proximally, ending at insertion, not decurrent; vaginant laminae ± 1/2–2/3 leaf length, unequal, minor lamina ending near margin; costa ending 6–15 cells before apex, bryoides-type; laminal cells 1-stratose, distinct, smooth, plane, firm-walled, long-hexagonal to oblong to regularly quadrate, decreasing in size from costa to margin, medial cells 10–54 × 12–25 µm, largest along costa, marginal cells 9–15 µm, juxtacostal cells in vaginant laminae pellucid, greatly enlarged. Sexual condition rhizautoicous and gonioautoicous. Sporophytes 1 per perichaetium. Seta 2.5–5 mm. Capsule theca exserted, usually inclined, slightly arcuate, bilaterally symmetric, infrequently erect, nearly radially symmetric, 0.7 mm; peristome scariosus-type; operculum 0.3–0.8 mm. Calyptra cucullate, smooth, 0.4 mm. Spores 9–13 µm.


Habitat: Bare gravelly soil in dried stream beds and on banks, sometimes found with F. crispus, often associated with the Coast Redwood Forest (L. F. Koch 1951)

Distribution

V27 496-distribution-map.gif

B.C., Calif., Oreg., Wash.

Discussion

Fissidens pauperculus is distinguished by its short costa, and smooth, plane laminal cells that gradually decrease in size outwardly. P. A. Florschütz (1964) equated specimens from Suriname with this species. R. A. Pursell (1994b) demonstrated, however, that the North American plants are different from those of South America. Although close to the South American plants that belong to F. inaequalis Mitten, the North American species differs by its slightly smaller laminal cells and in the absence of truncate-retuse vaginant laminae in the perichaetial leaves.

Selected References

None.

Lower Taxa

None.

No values specified."/2" is not declared as a valid unit of measurement for this property.

... more about "Fissidens pauperculus"
Ronald A. Pursell +
cucullate +
0.4 cm4 mm <br />0.004 m <br /> (?) +
cylindric +
erect +  and inclined +
0.7 cm7 mm <br />0.007 m <br /> (?) +
thin-walled +
6 +  and 15 +
hexagonal;oblong +
enlarged +
short-excurrent +
distinct +
variable +
reduced +
B.C. +, Calif. +, Oreg. +  and Wash. +
not decurrent +  and narrowed +
hyaline +, not +  and pigmented +
enlarged +, incrassate +  and small +
quadrate;oblong +
Bare gravelly soil in dried stream beds and on banks, sometimes found with F. crispus, often associated with the Coast Redwood Forest (L. F. Koch 1951) +
firm-walled +  and 1-stratose +
1-papillose +  and mammillose +
synoicous +, autoicous +, dioicous +  and sexual +
oblong +  and oblanceolate +
0 cm0 mm <br />0 m <br /> (0.06 cm0.6 mm <br />6.0e-4 m <br />) +
serrate +  and crenulate-serrulate +
narrowed +  and rounded +
long-rostrate +  and conic +
0.03 cm0.3 mm <br />3.0e-4 m <br /> (0.08 cm0.8 mm <br />8.0e-4 m <br />) +
axillary +  and basal +
papillose +
reddish +, darkening +  and yellow +
flexuous +  and straight +
elongate +
0.25 cm2.5 mm <br />0.0025 m <br /> (0.5 cm5 mm <br />0.005 m <br />) +
phaneroporous +
Moenkemeyera +  and Octodiceras +
Fissidens pauperculus +
Fissidens +
species +
inclined +  and erect +
ovoid +  and cylindric +
endostomate +  and haplolepidous +
undivided +  and divided +
reduced +
collenchymatous +
often thicker +
brownish;blackish +
0.2 cm2 mm <br />0.002 m <br /> (0.3 cm3 mm <br />0.003 m <br />) +
abscission +