Archidium hallii

Austin

Bull. Torrey Bot. Club 6: 145. 1877,.

Treatment appears in FNA Volume 27. Treatment on page 317. Mentioned on page 315.

Plants 3–10 mm, perennial, in dense short turfs, pale-green to yellow-green. Stems branched by several innovations from axils of stem-leaves or outer perichaetial leaves, often becoming prostrate with age. Stem-leaves erect-spreading, lanceolate to ovatelanceolate, acuminate, 0.7–1.5 mm, becoming reduced proximally; costa percurrent to slightly excurrent; laminal margins smooth, weakly recurved; median and distal laminal cells rhomboidal to hexagonal, 3–4: 1, 35–70 × 12–18 µm, proximal cells rectangular, 2–4: 1, 40–70 × 18–24 µm, short-rectangular to quadrate in alar region in 2–6 rows extending 7–15 cells along proximal laminal margin; leaves of innovations similar to distal stem-leaves except smaller, gradually reduced proximally. Perichaetial leaves larger, 1.5–3 mm, elongate-triangular, lanceolate or ovatelanceolate, gradually acuminate; costa percurrent to short-excurrent; laminal margins smooth, weakly recurved distally; median and distal laminal cells uniformly rhomboid to hexagonal, 3–7: 1, 35–130 × 15–28 µm, proximal cells rectangular, 4–6: 1, 70–140 × 15–28 µm, sometimes hyaline in alar region but cells not strongly differentiated. Specialized asexual reproduction absent. Sexual condition autoicous, antheridia terminating axillary leaf buds. Capsule terminal, 450-700 µm. Spores typically 20 (8–36) per capsule, triangular to rounded-polyhedral, 140–250 µm, smooth to granulose, yellow.


Phenology: Capsules mature early spring (Mar) or rarely late fall (Nov).
Habitat: Uncommon to rare on moist open sandy or loamy soil, along roadsides and in grassy often disturbed areas
Elevation: 0-200 m

Distribution

V27 433-distribution-map.gif

Fla., Ga., Tex., Mexico, South America

Discussion

Archidium hallii can be distinguished from similar-looking forms of A. tenerrimum by autoicous sexuality and leafy bracts enclosing the antheridia.

Selected References

None.

Lower Taxa

None.

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

... more about "Archidium hallii"
cleistocarpous +
John R. Spence +
Austin +
golden +  and brown +
lateral +  and terminal +
adjacent +  and mixed +
specialized +
undifferentiated +
7 +  and 15 +
sexual +  and asexual +
wide-rectangular;quadrate +
incrassate +
differentiated +
percurrent;short-excurrent +
strong +  and weak +
redbrown +, green +, pale gray +  and persistent +
smooth;finely serrulate +
incurved +  and recurved +
Fla. +, Ga. +, Tex. +, Mexico +  and South America +
0-200 m +
Uncommon to rare on moist open sandy or loamy soil, along roadsides and in grassy often disturbed areas +
differentiated +  and uniform to somewhat +
0.07 cm0.7 mm <br />7.0e-4 m <br /> (0.15 cm1.5 mm <br />0.0015 m <br />) +
erect-spreading +
acuminate;lanceolate;ovatelanceolate +
reduced +
monoicous +  and sexual +
acuminate;ovatelanceolate;lanceolate;elongate-triangular +
0.15 cm1.5 mm <br />0.0015 m <br /> (0.3 cm3 mm <br />0.003 m <br />) +
Capsules mature early spring (Mar) or rarely late fall (Nov). +
redbrown +, green +, pale gray +  and persistent +
Bull. Torrey Bot. Club +
smooth;granulose +
triangular;rounded-polyhedral +
0.1 cm1 mm <br />0.001 m <br /> (2 cm20 mm <br />0.02 m <br />) +
Archidium hallii +
Archidium +
species +
filiform +
pale-green +  and yellow-green +
small +  and minute +