Fissidens amoenus

Müller Hal.

Bot. Zeitung (Berlin) 5: 38. 1847,.

Synonyms: Fissidens austinii Barnes Fissidens hallii Austin Fissidens orcuttii Grout
Treatment appears in FNA Volume 27. Treatment on page 348. Mentioned on page 332, 333, 335, 337, 354.

Plants to 4.5 × 1.5 mm. Stem unbranched; axillary hyaline nodules present; central strands absent. Leaves as many as 10 pairs, ligulate to lanceolate, acute, usually apiculate, to 1.8 × 0.25 mm; dorsal lamina narrowed proximally, ending at insertion, not decurrent; vaginant laminae ± 1/2 leaf length, acute, ± unequal, minor lamina ending near margin; margin ± evenly crenulate-serrulate, elimbate except for weak limbidium on proximal parts of vaginant laminae of perichaetial leaves; costa percurrent to ending as many as 5 cells before apex, bryoides-type; laminal cells 1-stratose, distinct, smooth, often strongly bulging, firm-walled, irregularly quadrate to hexagonal, 8–11 µm, larger and ± oblong juxtacostally in proximal parts of vaginant laminae. Sexual condition rhizautoicous and gonioautoicous. Sporophytes 1 per perichaetium. Seta to 5 mm. Capsule theca exserted, erect, radially symmetric, to 0.6 mm; peristome bryoides-type; operculum 0.5 mm. Calyptra cucullate, smooth, 0.5 mm. Spores 11–16 µm.


Habitat: Soil of stream banks and ravines, bases of trees in cypress-gum swamps, sometimes on rotting wood

Distribution

V27 483-distribution-map.gif

Ala., Fla., La., Miss., N.C., Tex., Mexico, South America

Discussion

A small, attractive species, Fissidens amoenus can be recognized by its distinct laminal cells, crenulate-serrulate leaf margin, large, more or less oblong, pellucid cells in the proximal parts of the vaginant laminae, and weak limbidium restricted to the proximal parts of the vaginant laminae of perichaetial leaves. The laminal cells have been described as “inconspicuously 1-papillose” (H. A. Crum and L. E. Anderson 1981, as F. hallii), but since that condition is not always present it is perhaps best to regard these cells as strongly bulging.

Selected References

None.

Lower Taxa

None.

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

... more about "Fissidens amoenus"
Ronald A. Pursell +
Müller Hal. +
cucullate +
0.5 cm5 mm <br />0.005 m <br /> (?) +
cylindric +
0 cm0 mm <br />0 m <br /> (0.06 cm0.6 mm <br />6.0e-4 m <br />) +
thin-walled +
hexagonal;oblong +
shrunken +, large +  and enlarged +
distinct +
variable +
reduced +
Ala. +, Fla. +, La. +, Miss. +, N.C. +, Tex. +, Mexico +  and South America +
not decurrent +  and narrowed +
hyaline +, not +  and pigmented +
enlarged +, incrassate +  and small +
quadrate;oblong +
Soil of stream banks and ravines, bases of trees in cypress-gum swamps, sometimes on rotting wood +
firm-walled +  and 1-stratose +
1-papillose +  and mammillose +
acute;0mm;1.8mm +
acute +  and lanceolate +
unequal +
0 cm0 mm <br />0 m <br /> (0.025 cm0.25 mm <br />2.5e-4 m <br />) +
crenulate-serrulate +
narrowed +  and rounded +
long-rostrate +  and conic +
0.5 cm5 mm <br />0.005 m <br /> (?) +
Bot. Zeitung (Berlin) +
axillary +  and basal +
papillose +
reddish +, darkening +  and yellow +
flexuous +  and straight +
elongate +
0 cm0 mm <br />0 m <br /> (0.5 cm5 mm <br />0.005 m <br />) +
phaneroporous +
Fissidens austinii +, Fissidens hallii +  and Fissidens orcuttii +
Fissidens amoenus +
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 /> (0.45 cm4.5 mm <br />0.0045 m <br />) +
abscission +