Fissidens serratus var. serratus

Synonyms: Fissidens donnellii Austin
Treatment appears in FNA Volume 27. Treatment on page 351.

Plants to 2.8 × 1.5 mm. Stem unbranched and branched; axillary hyaline nodules present; central strand absent. Leaves as many as 6 pairs, lanceolate, acute to obtuse, to 1.5 × 0.2 mm; dorsal lamina narrowed proximally, ending at insertion, not decurrent; vaginant laminae ± 1/2 leaf length, ± equal, minor lamina ending on or near margin, often rounded and free; margin serrate, often coarsely and irregularly so on vaginant laminae, elimbate, or limbate and entire on proximal 1/2 or less of perichaetial leaves, limbidium weak, of 1–2 rows of cells, limbidial cells 1-stratose; costa percurrent to ending as many as 3 cells before apex, bryoides-type; laminal cells 1-stratose, distinct, sharply 1-papillose, firm-walled, irregularly quadrate to hexagonal, 7–11 µm. Sexual condition rhizautoicous; perigonial gemmiform, proximal to perichaetial stems. Sporophytes 1 per perichaetium. Seta to 3.5 mm. Capsule theca exserted, erect, radially symmetric, to 0.5 mm; peristome scariosus-type; operculum 0.5 mm. Calyptra cucullate, smooth, 0.4 mm. Spores 13–20 µm.


Habitat: Decaying logs, living cypress trees

Distribution

V27 490-distribution-map.gif

Fla., Mexico, West Indies, Central America, South America, Asia, Africa

Discussion

In North America, Fissidens serratus is restricted to peninsular Florida, extending north to Leon and Jefferson counties. The species is characterized by distinct, 1-papillose laminal cells and sharply serrate leaf margin, often coarsely and irregularly so on the vaginant laminae. Perichaetial leaves can be limbate and entire on proximal parts of vaginant laminae. Filamentous, muticellular gemmae have been observed at the stem apices of African plants. Variety leptochaete (Dusén) Bruggeman-Nannenga & Pursell (tropical America, tropical Africa, New Zealand) differs by having an intralaminal limbidium on vaginant laminae of most or all leaves.

Selected References

None.

Lower Taxa

None.

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

Ronald A. Pursell +
Müller Hal +
cucullate +
0.4 cm4 mm <br />0.004 m <br /> (?) +
cylindric +
0 cm0 mm <br />0 m <br /> (0.05 cm0.5 mm <br />5.0e-4 m <br />) +
1-stratose +  and limbidial +
hexagonal;oblong +
shrunken +, large +  and enlarged +
distinct +
variable +
reduced +
Fla. +, Mexico +, West Indies +, Central America +, South America +, Asia +  and Africa +
not decurrent +  and narrowed +
hyaline +, not +  and pigmented +
enlarged +, incrassate +  and small +
quadrate;oblong +
Decaying logs, living cypress trees +
firm-walled +  and 1-stratose +
acute +  and obtuse +
0 cm0 mm <br />0 m <br /> (0.02 cm0.2 mm <br />2.0e-4 m <br />) +
entire +  and serrate +
long-rostrate +  and conic +
0.5 cm5 mm <br />0.005 m <br /> (?) +
Bot. Zeitung (Berlin) +
axillary +  and basal +
papillose +
1 +  and 2 +
reddish +, darkening +  and yellow +
flexuous +  and straight +
elongate +
0 cm0 mm <br />0 m <br /> (0.35 cm3.5 mm <br />0.0035 m <br />) +
branched +  and unbranched +
phaneroporous +
Fissidens donnellii +
Fissidens serratus var. serratus +
Fissidens serratus +
variety +
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 /> (0.28 cm2.8 mm <br />0.0028 m <br />) +
abscission +