Isopterygium tenerifolium

Mitten

J. Linn. Soc., Bot. 12: 499. 1869.

Treatment appears in FNA Volume 28. Treatment on page 553. Mentioned on page 554.

Plants medium-sized, in thin, loose mats, yellow-green to green. Stems 2–4 cm, 2–3 mm wide. Leaves widespreading to squarrose, usually wrinkled and contorted when dry, ovatelanceolate to ovate, 1–1.5 × 0.4–0.7 mm; margins plane to erect throughout, serrulate proximally, serrate to serrulate distally; alar cells short-rectangular to quadrate, 19–33 × 9–19 µm, region small, with 1 or 2 cells on margins; medial laminal cells often flexuose, linear-fusiform, 71–141 × 5–7 µm. Specialized asexual reproduction absent. [Seta brown to reddish, 2–3 cm. Capsule horizontal to pendulous, sometimes nearly erect, light-brown to reddish, 1–1.5 mm; operculum obliquely short-rostrate. Spores 9–14 µm].


Phenology: Capsules mature fall.
Habitat: Low sandstone bluffs along rivers
Elevation: elevation unknown

Distribution

V28 861-distribution-map.gif

Miss., Mexico, West Indies, Central America, South America

Discussion

Isopterygium tenerifolium is known in the flora area from only one recent collection from Mississippi (Lauderdale County, eastern shore of Chunky River at Stukey Bridge, 32°15'N, 88°52'W, 30 September 1992, Buck 22129 CANM, NY). The species is morphologically close to I. tenerum, differing by the somewhat larger plants, stems often 2–4 cm, leaves 1–1.5 mm and usually wrinkled and contorted when dry, and seta 2–3 cm. The collection in CANM contains only one plant with an undeveloped sporophyte that has a seta of 2 cm; fully developed sporophytes remain unseen in the flora area. The species should be sought elsewhere in the Gulf Coast region where other populations likely occur.

Selected References

None.

Lower Taxa

None.
... more about "Isopterygium tenerifolium"
acuminate;acuminate +
Robert R. Ireland Jr. +
Mitten +
2 +  and 1 +
decurrent +
branched +  and multicellular +
papillose +
filamentous +
branched +  and multicellular +
erect-spreading;squarrose +
lanceolate +  and ovate +
papillose +
filamentous +
branched +  and multicellular +
papillose +
filamentous +
cucullate +
arcuate +  and straight +
erect +, inclined +  and cernuous +
ovoid +  and ellipsoid +
constricted +
branched +  and multicellular +
similar +  and pigmented +
papillose +
short-rectangular;quadrate +
enlarged +
filamentous +
differentiated +
9um +  and 19um +
rudimentary +
sometimes +  and short +
ecostate +  and obscure +
Miss. +, Mexico +, West Indies +, Central America +  and South America +
elevation unknown +
fused +  and free +
filamentous +
Low sandstone bluffs along rivers +
autoicous +  and sexual +
0.1 cm1 mm <br />0.001 m <br /> (0.15 cm1.5 mm <br />0.0015 m <br />) +
widespreading +  and squarrose +
wrinkled +
ovatelanceolate +  and ovate +
0.04 cm0.4 mm <br />4.0e-4 m <br /> (0.07 cm0.7 mm <br />7.0e-4 m <br />) +
serrate +  and serrulate +
dioicous +, autoicous +  and sexual +
conic +  and short-rostrate +
Capsules mature fall. +
J. Linn. Soc., Bot. +
papillose +  and smooth +
reddish-brown +, brown +  and yellow +
elongate +
spheric;ovoid +
branched +, multicellular +, sparingly +  and simple +
asymmetric +, 2-pinnate +  and 1-pinnate +
falcate-secund +
straight +
erect-spreading +  and squarrose +
papillose +
lanceolate +  and ovate +
2 cm20 mm <br />0.02 m <br /> (?) +  and 4 cm40 mm <br />0.04 m <br /> (?) +
filamentous +
differentiated +
2mm;3mm +
Isopterygium tenerifolium +
Isopterygium +
species +
yellow-green +  and green +