Fissidens littlei

(R. S. Williams) Grout

Moss Fl. N. Amer. 1: 249. 1939,.

Basionym: Moenkemeyera littlei R. S. Williams Bryologist 39: 40, plate 4. 1936
Treatment appears in FNA Volume 27. Treatment on page 354. Mentioned on page 334.

Plants to 3 × 2 mm. Stem unbranched and sparingly branched; axillary hyaline nodules absent; central strand absent. Leaves as many as 8 pairs, ligulate, obtuse-apiculate to acute, to 1.5 × 0.25 mm; dorsal lamina narrowed proximally, ending at insertion or slightly decurrent; vaginant laminae 1/2–2/3 leaf length, ± equal, minor lamina ending on or near margin; margin crenulate, often irregularly so on vaginant laminae, elimbate; costa ending 3–5 cells before apex, bryoides-type; lamina cells 1-stratose, distinct, mammillose, firm-walled, irregularly quadrate to hexagonal, oblate on margin, 8–10 µm, somewhat larger, ± oblong in proximal parts of vaginant laminae. Sexual condition rhizautoicous and gonioautoicous; perigonia gemmiform and on elongate stems. Sporophytes 1 per perichaetium. Seta 1.4–1.8 mm. Capsule theca exserted, erect, radially symmetric, to 0.5 mm long; peristome teeth anomalous, undivided, papillose; operculum to 0.3 mm. Calyptra cucullate, smooth, 0.3 mm. Spores 8–11 µm.


Habitat: Walls of small pockets in gypsum sinkholes

Discussion

This rare Fissidens, named in honor of the American botanist Elbert Little, is known only from the type locality and was recently re-discovered there by K. W. Allred (1998). The plants are pale green, probably the result of their occurrence in small pocketlike depressions where direct sunlight does not penetrate. The species has been confused with F. amoenus, but differs from the latter by its elimbate leaves, slightly smaller, mammillose laminal cells, oblate marginal cells, absence of enlarged pellucid cells in the proximal parts of the vaginant laminae, and undivided, papillose peristome teeth.

Selected References

None.

Lower Taxa

None.

"/2" is not declared as a valid unit of measurement for this property.

... more about "Fissidens littlei"
Ronald A. Pursell +
(R. S. Williams) Grout +
Moenkemeyera littlei +
cucullate +
0.3 cm3 mm <br />0.003 m <br /> (?) +
cylindric +
0 cm0 mm <br />0 m <br /> (0.05 cm0.5 mm <br />5.0e-4 m <br />) +
thin-walled +
3 (?) +  and 5 (?) +
hexagonal;oblong +
shrunken +, large +  and enlarged +
short-excurrent +
distinct +
variable +
reduced +
decurrent +  and narrowed +
hyaline +, not +  and pigmented +
enlarged +, incrassate +  and small +
quadrate;oblong +
Walls of small pockets in gypsum sinkholes +
firm-walled +  and 1-stratose +
oblong +, oblate +, irregularly quadrate +  and hexagonal +
firm-walled +, stratose +, 2-stratose +, 1-stratose +, guttulate +  and eguttulate +
1-papillose +  and mammillose +
synoicous +, autoicous +, dioicous +  and sexual +
equal;0mm;1.5mm +
obtuse-apiculate +  and acute +
0 cm0 mm <br />0 m <br /> (0.025 cm0.25 mm <br />2.5e-4 m <br />) +
entire +  and serrate +
crenulate +
narrowed +  and rounded +
long-rostrate +  and conic +
0 cm0 mm <br />0 m <br /> (0.03 cm0.3 mm <br />3.0e-4 m <br />) +
Moss Fl. N. Amer. +
axillary +  and basal +
papillose +
reddish +, darkening +  and yellow +
flexuous +  and straight +
elongate +
0.14 cm1.4 mm <br />0.0014 m <br /> (0.18 cm1.8 mm <br />0.0018 m <br />) +
branched +  and unbranched +
elongate +
phaneroporous +
Moenkemeyera +  and Octodiceras +
Fissidens littlei +
Fissidens +
species +
inclined +  and erect +
ovoid +  and cylindric +
endostomate +  and haplolepidous +
undivided +  and divided +
reduced +
collenchymatous +
often thicker +
brownish;blackish +
0 cm0 mm <br />0 m <br /> (0.3 cm3 mm <br />0.003 m <br />) +
abscission +