Dicranodontium asperulum

(Mitten) Brotherus in H. G. A. Engler and K. Prantl

in H. G. A. Engler and K. Prantl, Nat. Pflanzenfam. 208[I,3]: 336. 1901,.

Basionym: Dicranum asperulum Mitten J. Linn. Soc., Bot., suppl. 1: 22. 1859
Synonyms: Campylopus virginicus (Austin) Lesquereux & James Dicranum virginicum Austin
Treatment appears in FNA Volume 27. Treatment on page 394. Mentioned on page 395.

Plants brown proximally, yellowish to dark green distally, dull to glossy, in loose tufts. Stems 1–6 (–8) cm, radiculose proximally with whitish to reddish-brown rhizoids. Leaves erect-patent, flexuose, spreading at ca. 45º or more when wet, occasionally falcate-secund at stem apices, 3–8 mm, often deciduous, abruptly narrowed from an ovate base into a setaceous subula, subtubulose proximally, channeled distally, margins serrulate to serrate at shoulders, usually strongly serrate distally, apex acute; costa distinct, occupying ca. 1/3 of leaf base; cells not thick-walled or pitted, distal cells linear, 24–56 × 5–6 µm, basal-cells broadly rectangular, hyaline, ca. 9 µm wide, alar cells sometimes forming indistinct auricles, hyaline. Seta 15–20 mm, erect-sinuose. Capsule 1.5–2 mm; operculum not seen, reportedly shorter than the capsule. Spores 9–14 µm.


Habitat: Damp, shaded, acidic cliff faces and cliff shelves, occasionally on earth of overturned tree roots
Elevation: 0-1200 m

Discussion

Sporophytes of Dicranodontium asperulum were seen in North America only in one British Columbia specimen. The wide-spreading leaves, standing out from the stem at 45° or more when wet, and the serrate to serrulate shoulders of the leaf bases make D. asperulum the most distinctive North American species of the genus. The leaves of the other species are appressed or weakly spreading when wet, with entire bases.

Selected References

None.

Lower Taxa

None.
... more about "Dicranodontium asperulum"
persistent +  and deciduous +
Robert R. Ireland Jr. +
(Mitten) Brotherus in H. G. A. Engler and K. Prantl +
short to long +
rectangular +
Dicranum asperulum +
microphyllous +
pseudomonoicous +, dioicous +, autoicous +  and sexual +
reproduction +  and asexual +
cucullate +
oblong-cylindric +
0.15 cm1.5 mm <br />0.0015 m <br /> (0.2 cm2 mm <br />0.002 m <br />) +
not thick-walled +
specialized +
dioicous +  and sexual +
inflated +
incrassate +
percurrent;excurrent +
distinct +
prorate on abaxial surface +  and smooth +
rectangular +  and linear +
5um (?) +  and 6um (?) +
B.C. +, Alaska +, Ga. +, Ky. +, N.C. +, Tenn. +, Va. +, W.Va. +, Europe +  and Asia +
0-1200 m +
Damp, shaded, acidic cliff faces and cliff shelves, occasionally on earth of overturned tree roots +
falcate-secund +
erect-flexuose +
auriculate +  and acute +
falcate-secund +
flexuose +
deciduous +
channeled +  and narrowed +
0.3 cm3 mm <br />0.003 m <br /> (0.8 cm8 mm <br />0.008 m <br />) +
serrate +  and serrulate +
long-rostrate +
nonpitted +  and pitted +
toothed +  and forked +
filamentous +
pitted-striolate +
papillose +  and striolate +
undifferentiated +
in H. G. A. Engler and K. Prantl, Nat. Pflanzenfam. +
whitish +  and reddish-brown +
erect-sinuose +
erect-sinuous +  and curved +
cygneous +  and elongate +
1.5 cm15 mm <br />0.015 m <br /> (2 cm20 mm <br />0.02 m <br />) +
spherical +
falcate-secund +
branched;simple +
1 cm10 mm <br />0.01 m <br /> (6 cm60 mm <br />0.06 m <br />) +
superficial +
setaceous +
Campylopus virginicus +  and Dicranum virginicum +
Dicranodontium asperulum +
Dicranodontium +
species +
deciduous +
striolate +
divided +
yellowish +  and dark green +
dull +  and glossy +
medium-sized;large +