Ditrichum tortuloides

Grout

Bryologist 30: 4. 1927,.

Treatment appears in FNA Volume 27. Treatment on page 457. Mentioned on page 451, 452, 456, 458.

Plants green to yellowish green, becoming brown with age, dull, in loose to somewhat dense tufts. Stems 2–5 mm, simple or seldom branched, with a few dark red rhizoids near the base. Leaves erect-spreading, slightly crisped to falcate-secund when dry, 1–3 mm, lanceolate to linear-lanceolate, channelled, lamina 1-stratose except near margins; margins plane to narrowly recurved from just beyond the leaf base to mid leaf, serrate to strongly serrate from mid leaf to the acute apex, 2-stratose distally and rarely a cell inward; costa distinct, percurrent, occupying 1/6–1/3 width of the leaf base; lamina cells thick-walled, distal cells 8–24 × 8 µm, becoming slightly broader and longer in the base. Specialized asexual reproduction unknown. Sexual condition dioicous. Seta orange-yellow, brownish or reddish, 0.8–1.2 cm, erect. Capsule erect, yellow or light-brown, curved and asymmetric, 1–2 (–2.5) mm, often swollen at the base; operculum rostrate, 0.5–0.8 mm; peristome 200 µm, 2-fid, the filaments ± unequal, linear, somewhat twisted when dry, strongly papillose to spiculose. Spores round, 9–13 µm, appearing smooth to minutely papillose.


Phenology: Capsules mature spring (Jun).
Habitat: Primarily on serpentine soils, clearings along roads
Elevation: moderate elevations (ca. 400 m)

Discussion

Ditrichum tortuloides was synonymized by H. A. Crum and L. E. Anderson (1981) with D. ambiguum. However, R. R. Ireland and H. Robinson (2001) discussed reasons for distinguishing the two species. For a discussion of the similarities and distinguishing characteristics, see under 1. D. ambiguum.

Selected References

None.

Lower Taxa

None.
... more about "Ditrichum tortuloides"
forming a marginal border +  and not differentiated +
Rodney D. Seppelt +, Robert R. Ireland Jr. +  and Harold Robinson +
cucullate +
0.2 cm2 mm <br />0.002 m <br /> (0.25 cm2.5 mm <br />0.0025 m <br />) +
light-brown;yellow +
cleistocarpous +
0.1 cm1 mm <br />0.001 m <br /> (0.2 cm2 mm <br />0.002 m <br />) +
distinct +
subpercurrent +
1/6 +  and 1/3 +
1/6 width of leaf base;1/3 width of leaf base +
shortrectangular +  and isodiametric +
dioicous +, sexual +  and asexual +
Broader (?) +  and 8 (?) +
Md. +, N.H. +  and Vt. +
moderate elevations (ca. 400 m) +
spiculose +  and twisted +
Primarily on serpentine soils, clearings along roads +
papillose +  and smooth +
dioicous +, monoicous +  and sexual +
falcate-secund +
flexuose +
lanceolate +  and linear-lanceolate +
0.1 cm1 mm <br />0.001 m <br /> (0.3 cm3 mm <br />0.003 m <br />) +
serrate +  and strongly serrate +
0.05 cm0.5 mm <br />5.0e-4 m <br /> (0.08 cm0.8 mm <br />8.0e-4 m <br />) +
with a longer , broader sheathing base +  and differentiated +
on short branches +  and axillary +
200 cm2,000 mm <br />2 m <br /> (?) +
Capsules mature spring (Jun). +
filamentous +
reddish;brownish;orange-yellow +
flexuose +
elongate +
0.8 cm8 mm <br />0.008 m <br /> (1.2 cm12 mm <br />0.012 m <br />) +
papillose +
branched +  and simple +
reaching 2 cm +  and short +
0.2 cm2 mm <br />0.002 m <br /> (0.5 cm5 mm <br />0.005 m <br />) +
Ditrichum tortuloides +
Ditrichum +
species +
specialized +
synoicous +, paroicous +, autoicous +, dioicous +  and sexual +
brown +, green +  and yellowish green +
small +  and medium-sized +