Bryokhutuliinia obtusifolia

Name

Bryokhutuliinia obtusifolia

Rank

Species

Generic Name

[Genus] Bryokhutuliinia

Authors (Pub.)

Ignatov M. S. Shcherbakov D. E.  

Publication

Lower Cretaceous mosses from Khasurty (Baikal Area of South Siberia) [2011/12]

Journal

Arctoa

Volume

20

Page number

20

Year

2011

Fossil Status

leafy twigs

Stratigraphy

Lower Cretaceous

Strat. comment

Gusinoe Lake Group

Location

10 km S of Tsakir, roadcut at left bank of Khasurty River 0.7 km upstream Dzhidot Creek, Zakamensk District, Republic of Buryatia, western Transbaikalia, Russian Federation [50°21'N – 103°38'E]

Paleoregion

Eurasia (Siberia)

Data for Holotypus

Repository

Palaeontological Institute, Russian Academy of Sciences, Moscow, Russian Federation

Repository Number

PIN 5438/76

Num

11-12

Pub.

Lower Cretaceous mosses from Khasurty (Baikal Area of South Siberia) [2011/12]

Diagnosis

Plants in loose wefts. Stem creeping or floating to ascending and almost erect, >14 cm long, 0.35-0.45 mm wide, terminated at least sometimes by a leaf rosette formed by 7-15 leaves, foliage terete and variable from loose to dense in subapical part or occasionally all along stem; irregularly pinnately branched, branches deviating from stem at (25-)50-75°(100°), straight, to 2 cm long, often poorly differentiated from stem in width and foliage, or leaves are more densely arranged, subcomplanate and having more acute angle with branch axis compared with nearby stem leaves. Proximal branch leaves smaller and sometimes remote, without apparent group of crowded leaves at branch base. Stem leaves deviating from stem at broad angle (55-80°), patent to gradually reflexed and sometimes abruptly reflexed, up to 150°(-180°) with stem or sometimes reflexed from their bases, to 3.0-4.0(-4.3)×1.5-2.1 mm, ovate-elongate to lingulate, broadly rounded at apex or occasionally apiculate (the latter usually takes place in parts of stems with smaller and more remote leaves), rounded below and at base somewhat clasping, plane or only weakly concave; margin entire, bordered throughout, border dark, ca. 50 μm wide, formed by darker cells only slightly narrower than laminal cells. Cells rectangular, 6090×13-20 μm, shorter and slightly broader towards apex (up to 2:1, and to 25-30 μm wide), and also broader to alar region of leaf base, to 30-42 μm wide. Branch leaves smaller, to 3.3×1.2 mm, relatively narrower and less reflexed, otherwise similar to stem leaves. Ends of shoots sometimes with a zone with leaves abruptly much smaller, to 0.5 mm long, ovate-lanceolate, acute; in some cases nearby part of stem is leafless due to deciduous leaves, likely those smaller ones.