Arctoa anderssonii

Wichura

Flora 42: 432, plate 7, figs. 3–8. 1859,.

Synonyms: Arctoa fulvella var. anderssonii (Wichura) Grout
Treatment appears in FNA Volume 27. Treatment on page 362.

Plants small, in compact, yellowbrown or green tufts. Stems (0.5–) 1–2 (–4) cm. Leaves erect spreading or falcate-secund, lanceolate, subulate, 2–3 mm; costa 30–55 µm wide at base, long-excurrent, rough near tip; distal laminal cells mostly quadrate (2–5:1), incrassate; basal laminal cells elongate, alar cells differentiated. Perichaetial leaves much larger than stem-leaves. Seta short, 1–3 mm. Capsule immersed in perichaetial leaves, straight; peristome teeth spreading outward when dry. Spores 16–27 µm.


Phenology: Capsules mature summer.
Habitat: Siliceous rock
Elevation: high elevations

Discussion

A rare high-arctic species, Arctoa anderssonii was once considered a variety of A. fulvella, but is distinguished by a short seta, large perichaetial leaves, and straight, immersed capsule. It has a costa that is more shortly excurrent than that of A. fulvella but longer than that of A. hyperborea.

Selected References

None.

Lower Taxa

None.
... more about "Arctoa anderssonii"
persistent +  and deciduous +
Steven G. Newmaster +
Wichura +
short to long +
pseudomonoicous +, dioicous +, autoicous +  and sexual +
reproduction +  and asexual +
cucullate +
constricted +
papillose +  and mammillose +
inflated +
differentiated +
long-excurrent +
30um;55um +
mammillose +  and smooth +
Greenland +, Yukon +  and Europe +
high elevations +
Siliceous rock +
falcate-secund +
subulate +  and lanceolate +
0.2 cm2 mm <br />0.002 m <br /> (0.3 cm3 mm <br />0.003 m <br />) +
serrulate +  and entire +
nonpitted +  and pitted +
toothed +  and forked +
autoicous +  and sexual +
pitted-striolate +
Capsules mature summer. +
undifferentiated +
flexuose +  and straight +
cygneous +  and elongate +
0.1 cm1 mm <br />0.001 m <br /> (0.3 cm3 mm <br />0.003 m <br />) +
spheric +
simple or;dichotomously irregularly branched +
1 cm10 mm <br />0.01 m <br /> (2 cm20 mm <br />0.02 m <br />) +
differentiated +
superficial +
Arctoa fulvella var. anderssonii +
Arctoa anderssonii +
species +
deciduous +
lanceolate +
green +  and yellowbrown +
0.05 cm0.5 mm <br />5.0e-4 m <br /> (0.12 cm1.2 mm <br />0.0012 m <br />) +
dark green +  and yellowish-brown +