Archidium donnellii


Bull. Torrey Bot. Club 6: 190. 1877,.

Synonyms: Archidium ohioense var. donnellii (Austin) Lesquereux & James
Treatment appears in FNA Volume 27. Treatment on page 317. Mentioned on page 315.

Plants 2–10 mm, perennial, in dense turfs, yellow-green. Stems simple or usually branched by several sterile innovations, becoming prostrate with age. Stem-leaves erect to erect-spreading, lanceolate to narrowly ovatelanceolate, acuminate, 1–2.5 mm; costa percurrent or short-excurrent, sometimes somewhat subulate; laminal margins recurved, smooth or finely serrulate distally; median and distal laminal cells irregular in shape, mixed quadrate, trapezoidal, short-rectangular, short to long-rhomboidal, 14–75 × 8–13 µm, proximal cells quadrate to short-rectangular, similar to median and distal cells; leaves of innovations similar to stem-leaves, not much reduced proximally. Perichaetial leaves broadly ovatelanceolate, narrowly acuminate to subulate, sometimes flexuose to secund, same size as stem-leaves; costae short to long excurrent, hairpoint pellucid, sometimes finely spinose; laminal margins recurved, smooth to finely serrulate; distal and median laminal cells similar to stem-leaves, proximal laminal cells lax, wider, rectangular, 2–4: 1, 35–115 × 12–25 µm, sometimes somewhat hyaline. Specialized asexual gemmae absent. Sexual condition autoicous; antheridia terminating axillary leaf buds. Capsule terminal, 425–750 µm. Spores typically 28 (4–60) per capsule, angular to irregularly polyhedral, 120–230 µm, smooth or finely granulose, yellow to orange-red.

Phenology: Capsules mature early spring (Mar), more rarely in autumn or winter (Oct–Dec).
Habitat: Uncommon on moist to dry soil along roadsides, in fields, rarely on rock
Elevation: 0-250 m


V27 432-distribution-map.gif

Ill., Md., Okla., N.C., S.C., Tex., Va., Mexico


Archidium donnellii usually can be distinguished from other species by irregular areolation in median and distal portions of lamina, proximal lamina cells not strongly differentiated, and sexuality autoicous. It tends to grow in drier habitats than do other species of the genus.

Selected References


Lower Taxa


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

... more about "Archidium donnellii"
cleistocarpous +
John R. Spence +
Austin +
golden +  and brown +
lateral +  and terminal +
adjacent +  and mixed +
undifferentiated +
wide-rectangular;quadrate +
incrassate +
differentiated +
excurrent;short-excurrent;percurrent +
strong +  and weak +
subulate +
short to long +
redbrown +, green +, pale gray +  and persistent +
smooth;finely serrulate +
incurved +  and recurved +
Ill. +, Md. +, Okla. +, N.C. +, S.C. +, Tex. +, Va. +  and Mexico +
0-250 m +
specialized +
autoicous +, sexual +  and asexual +
Uncommon on moist to dry soil along roadsides, in fields, rarely on rock +
differentiated +  and uniform to somewhat +
smooth +  and finely serrulate +
0.1 cm1 mm <br />0.001 m <br /> (0.25 cm2.5 mm <br />0.0025 m <br />) +
erect;erect-spreading +
acuminate;lanceolate;narrowly ovatelanceolate +
monoicous +  and sexual +
narrowly acuminate;subulate +
Capsules mature early spring (Mar), more rarely in autumn or winter (Oct–Dec). +
redbrown +, green +, pale gray +  and persistent +
Bull. Torrey Bot. Club +
yellow;orange-red +
granulose;smooth +
angular;irregularly polyhedral +
branched;simple +
0.1 cm1 mm <br />0.001 m <br /> (2 cm20 mm <br />0.02 m <br />) +
Archidium ohioense var. donnellii +
Archidium donnellii +
Archidium +
species +
filiform +
synoicous +, paroicous +  and autoicous +
small +  and minute +