Stegonia latifolia

(Schwägrichen) Venturi ex Brotherus

Laubm. Fennosk., 145. 1923,.

Basionym: Weissia latifolia Schwägrichen in J. A. Schultes, Reise Glockner 2: 362. 1804
Synonyms: Pottia latifolia (Schwägrichen) Müller Hal.
Treatment appears in FNA Volume 27. Treatment on page 604. Mentioned on page 632.

Seta (2–) 4–12 mm. Capsule stegocarpous, exerted, ovate-cylindric, to 1–2 mm, operculum short-rostrate, peristome teeth rudimentary or 16, cleft to near base. Also keying to this species a distinctive new species described but not formally named by B. M. Murray (1992) for Alaska; a formal description will provided in another publication. The new species shares with Stegonia the characteristic rudimentary peristome, ovate leaf with a triangle of clear cells apically and abaxial cell-walls more thickened than the adaxial, and bulliform cells on the adaxial surface of the costa, but possesses three kinds of adaxial costal lamellae: (1) rounded lamellae typical of Pterygoneurum, (2) additional, serrate, papillose lamellae near the leaf apex just distal to the rounded lamellae, and (3) on small leaves only lamellae consisting entirely of bulliform, nonpapillose cells.

Distribution

V27 870-distribution-map.gif

Widespread in Northern Hemisphere, Antarctic

Discussion

Varieties 2 (2 in the flora).

Stegonia latifolia is uncommon but distinctive. In section, the leaves show a characteristic thickening of the abaxial superficial cell walls, similar to that of some species of Acaulon, a genus which differs in the red laminal color reaction to KOH and spheric capsules.

Selected References

None.

Key

1 Leaves muticous, costa ending before the apex Stegonia latifolia var. latifolia
1 Leaves awned, costa excurrent in most leaves as a hyaline hair point Stegonia latifolia var. pilifera
... more about "Stegonia latifolia"
serrate +, rounded +  and lamelliform +
0.15 cm1.5 mm <br />0.0015 m <br /> (0.2 cm2 mm <br />0.002 m <br />) +
of 2;3 rows +
of 1-2 rows +  and differentiated +
long-excurrent +  and short-excurrent +
Rounded (?) +  and Acute (?) +
Richard H. Zander +
(Schwägrichen) Venturi ex Brotherus +
flexuose +
papillose +  and smooth +
usually slightly wider +
usually ovate;oblong +
not differentiated +
Weissia latifolia +
obovoid +
cucullate +
stegocarpous +
ovate-cylindric +
0.1 cm1 mm <br />0.001 m <br /> (0.2 cm2 mm <br />0.002 m <br />) +
monoicous +, sexual +  and asexual +
vesiculose +, thick-walled +  and firm-walled +
persistent +
entire +  and serrulate +
incurved +  and recurved +
Few (?) +  and Several (?) +
nonpapillose +
bulliform +
tomentose +  and bare +
hexagonal;rhomboid;elongate;hexagonal;rhomboid;hexagonal;rhomboid;elongate;hexagonal;rhomboid +
Widespread in Northern Hemisphere +  and Antarctic +
differentiated +
multicellular +
yellow +  and orange-red or red +
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 +
dentate +  and entire +
short-rostrate +
photosynthetic +
compound +, simple +, hollow +  and solid +
flattened +  and 2-fid +
lateral +  and terminal +
lateral +  and terminal +
rudimentary +  and characteristic +
ligulate +  and perforate +
red +, orange +  and yellow +
1 (?) +, 0 (?) +  and 4 (?) +
0-30 um +  and differentiated +
not differentiated +
Laubm. Fennosk., +
straight +
0.2 cm2 mm <br />0.002 m <br /> (0.4 cm4 mm <br />0.004 m <br />) +
elongate +
0.4 cm4 mm <br />0.004 m <br /> (1.2 cm12 mm <br />0.012 m <br />) +
2 +  and 1 +
yellow +  and laminal +
rounded-triangular +  and rounded-pentagonal +
0 cm0 mm <br />0 m <br /> (0.3 cm3 mm <br />0.003 m <br />) +
Pottia latifolia +
Stegonia latifolia +
Stegonia +
species +
ovate;ovate-cylindric +
0.1 cm1 mm <br />0.001 m <br /> (0.2 cm2 mm <br />0.002 m <br />) +
yellow distally and red +, orange +, red +  and yellow +
often somewhat thicker +
ovate +  and circular to very +
0.7 cm7 mm <br />0.007 m <br /> (?) +
stemless +  and perigoniate +
brown;white;whitish green distally +
plant +  and gregarious +
occasionally smaller than the perichaetiate +