Hennediella heimii var. arctica

(Lindberg) R. H. Zander

Bull. Buffalo Soc. Nat. Sci. 32: 248. 1993,.

Basionym: Pottia heimii var. arctica Lindberg Öfvers. Kongl. Vetensk.-Akad. Förh. 23: 551. 1867
Synonyms: Desmatodon heimii var. arcticus (Lindberg) H. A. Crum Gymnostomum obtusifolium Pottia heimii var. obtusifolia (R. Br. bis) I. Hagen
Treatment appears in FNA Volume 27. Treatment on page 636.

Leaves broadly ovate to broadly elliptic, concave and often cucullate, apex usually obtuse, margins usually entire; costa often ending before the apex.


Phenology: Capsules mature late summer (Aug).
Habitat: Exposed soil, silt
Elevation: low elevations

Distribution

V27 937-distribution-map.gif

Greenland, N.W.T., Nunavut, Ont., Alaska, Europe, n Asia

Discussion

Variety arctica is a somewhat poorly circumscribed taxon largely restricted to the Arctic. It is generally much smaller than var. heimii, with leaves commonly 0.5–0.8 mm.

Selected References

None.

Lower Taxa

None.
0.4 cm4 mm <br />0.004 m <br /> (0.7 cm7 mm <br />0.007 m <br />) +
channeled +  and plane +
0.3 cm3 mm <br />0.003 m <br /> (0.4 cm4 mm <br />0.004 m <br />) +
of 1-2 rows +  and differentiated +
long-excurrent +  and short-excurrent +
Richard H. Zander +
(Lindberg) R. H. Zander +
round +  and elliptic +
papillose +  and smooth +
usually slightly wider +
usually ovate;oblong +
not differentiated +
Pottia heimii var. arctica +
obovoid +
flaring +  and cucullate +
stegocarpous +
dioicous +, cladautoicous +, autoicous +, sexual +  and asexual +
flat +  and weakly convex +
thin;evenly thickened +
vesiculose +  and thick-walled +
3 (?) +  and 4 (?) +
elongate +
tomentose +  and bare +
short-excurrent +  and percurrent +
2-3-stratose +, thick-walled +  and bordered +
shortrectangular;quadrate;hexagonal +
Greenland +, N.W.T. +, Nunavut +, Ont. +, Alaska +, Europe +  and n Asia +
low elevations +
differentiated +
multicellular +
Exposed soil, silt +
yellow +  and orange-red or red +
autoicous +, synoicous +, monoicous +  and sexual +
0.15 cm1.5 mm <br />0.0015 m <br /> (0.35 cm3.5 mm <br />0.0035 m <br />) +
concave;keeled;channeled;ovoid;lanceolate or lingulate +
cucullate +, concave +, broadly ovate +  and broadly elliptic +
somewhat larger +
denticulate +
conic;rostrate +
photosynthetic +
simple +  and hollow +
6 +  and 8 +
lateral +  and terminal +
lateral +  and terminal +
red +, orange +  and yellow +
of 32 long , filamentous teeth +  and rudimentary +
Capsules mature late summer (Aug). +
1 (?) +, 4 (?) +  and 6 (?) +
Bull. Buffalo Soc. Nat. Sci. +
straight +
elongate +
0.5 cm5 mm <br />0.005 m <br /> (1.5 cm15 mm <br />0.015 m <br />) +
2 +  and 1 +
red +  and laminal +
spreading;incurved;appressed +
rounded-triangular +  and rounded-pentagonal +
0.5 cm5 mm <br />0.005 m <br /> (1 cm10 mm <br />0.01 m <br />) +
Desmatodon heimii var. arcticus +, Gymnostomum obtusifolium +  and Pottia heimii var. obtusifolia +
Hennediella heimii var. arctica +
Hennediella heimii +
variety +
wide-mouthed +
0.24 cm2.4 mm <br />0.0024 m <br /> (0.35 cm3.5 mm <br />0.0035 m <br />) +
ovate;cylindric +
0.1 cm1 mm <br />0.001 m <br /> (0.24 cm2.4 mm <br />0.0024 m <br />) +
yellow distally and red +, orange +, red +  and yellow +
stemless +  and perigoniate +
reddish-brown;green +
occasionally smaller than the perichaetiate +