Frullania kachinensis Y.Li, Y.-D.Wang & K.Feldberg
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publication ID |
https://dx.doi.org/10.3897/fr.25.82362 |
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publication LSID |
lsid:zoobank.org:pub:45048AF3-36F0-4E93-AB96-07BE0F9258D9 |
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persistent identifier |
https://treatment.plazi.org/id/F501252A-857F-5FDE-87B2-D49B54B85614 |
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treatment provided by |
by Pensoft |
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scientific name |
Frullania kachinensis Y.Li, Y.-D.Wang & K.Feldberg |
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Frullania kachinensis Y.Li, Y.-D.Wang & K.Feldberg
Figs 1 View Figure 1 , 2 View Figure 2
Frullania kachinensis Y.Li, Y.-D.Wang & K.Feldberg; in Geological Journal 56: 5048, figs 1-3. 2021.
Holotype.
PB22711a, Nanjing Institute of Geology and Palaeontology, Chinese Academy of Sciences.
Paratypes.
PB22711c, d, Nanjing Institute of Geology and Palaeontology, Chinese Academy of Sciences; ZMNH155047a, d, e, ZMNH155048c, Zhejiang Museum of Natural History, China.
Additional specimens investigated.
GZG.BST.22040 ( Müller BuB4431), Geoscience Centre (GZG) at the University of Göttingen, Germany.
Locality and horizon.
Amber mines southwest of the village of Tanai ca. 105 km north of Myitkyina in Kachin State, northern Myanmar, fossil enclosed in upper Albian-lower Cenomanian Kachin amber.
Emended diagnosis.
Sterile shoots irregularly branched. Foliation incubous; lateral leaves complicate-trilobed, dorsal lobe ovate to elliptic with rounded apex and mamillose cells, ventral lobule Frullania -type, cylindrical, helmet-shaped to campanulate, with toothed margins, stylus narrow lanceolate to linear. Underleaves distant to contiguous, elliptic to elongate ovate, bilobed 0.3-0.8 × their length; lobes lanceolate, entire-margined to strongly toothed or ciliate, sinus more or less V-shaped. Rhizoids in bundles, inserted just below sinus.
Emended description.
Gametophyte fragments 2.89-4.91 mm long, reddish to yellowish brown (Figs 1A, B View Figure 1 , 2A View Figure 2 ), main shoots 0.46-1.00 mm wide, irregularly branched; branches 0.64-1.67 mm long and 0.28-0.92 mm wide. Stem reddish brown to dark brown, 37-65 μm in diameter. Lateral leaves incubous, (sub)horizontally spreading, alternate, imbricate to contiguous, complicate-trilobed. Dorsal lobe slightly concave to nearly flat (Figs 1A-D View Figure 1 , 2A-C View Figure 2 ), ovate to elliptic, on main shoots 290-550 μm long × 200-380 μm wide, length:width ratio 1.2-1.5:1; entire-margined, gradually narrowed towards apex or apex broadly rounded; dorsally extending 0.5-1.2 × the stem width beyond the farther edge of the stem. Lobe cells hexagonal, marginal cells (sub)isodiametric, 15-25 µm in diameter, medial cells slightly elongate, 16-36 μm long × 12-25 μm wide, up to 1.5 × as long as wide (Figs 1C-E View Figure 1 , 2B, C View Figure 2 ); cell walls thin to moderately thickened, with small triangular trigones, no intermediate thickenings seen; one large mamilla per cell, ca. 5 µm high and 7.5-10 µm in diameter (Figs 1E View Figure 1 , 2C View Figure 2 ), or leaf cells smooth. Ocelli not seen, but occasionally dorsal lobes with conspicuous large and elongated cells in the middle. Ventral lobule Frullania -type (Figs 1A-D View Figure 1 , 2 View Figure 2 ), cylindrical, helmet-shaped to campanulate, inflated, broadest part near opening, 110-220 μm long × 80-210 μm wide, length-width ratio 0.8-2.2:1, inserted in ca. 30-90 μm distance to stem, either nearly parallel to stem or obliquely positioned with upper part oriented towards stem and sometimes overlapping stem; opening not constricted, slightly emarginated, with short, acute tip on outer margin, dorsal and ventral margins angular, with one acute tooth in the middle (Figs 1B-D View Figure 1 , 2C, D View Figure 2 ), tooth up to 10 µm (one cell) long, possibly bearing slime papillae at tip [seen on one tooth in GZG.BST.22040]; lobule cells isodiametric, hexagonal, 11-24 μm in diameter, smooth to mamillose. Stylus narrow, lanceolate to linear, 30-40 µm long, base 2-3 cells wide with uniseriate apex of 1-3 cells. Underleaves distant to contiguous, 180-310 μm long × 50-150 μm wide, length:width ratio 2.1-3.6:1, elliptic to elongate ovate, bilobed 0.3-0.8 × their length (Figs 1F-H View Figure 1 , 2C, D View Figure 2 ), underleaf lobes lanceolate, (2)4-5(8) cells wide at base [not well visible on GZG.BST.22040], gradually narrowing into a single cell wide filament, apically terminated by a slime papilla; lobes entire or weakly to strongly toothed or ciliate, with up to six 10-55 µm long teeth or cilia consisting of 1-3 uniseriate, quadrate to rectangular cells; teeth and cilia becoming successively smaller towards lobe tip; margins of lower lamina generally entire, occasionally crenulate due to protruding cells or with short teeth (Fig. 2C, D View Figure 2 ); underleaf sinus more or less V-shaped with an acute to obtuse vertex. Rhizoids in bundles (Fig. 1G, H View Figure 1 ), inserted just below sinus of underleaves, bundles up to 160 µm long and 20-30 µm wide at base; rhizoids ca. 10 µm in diameter. Sterile.
Remarks.
The new fossil of F. kachinensis (Fig. 1 View Figure 1 ) is in rather good accordance with the type (Fig. 2 View Figure 2 ), but some characters are more conspicuous. Most notable are the rhizoid bundles inserted directly below the underleaf sinus as well as the strongly toothed to ciliate underleaf lobes (Fig. 1G, H View Figure 1 ) and the toothed lobule margins (Fig. 1B-D View Figure 1 , indicated by white arrows). A reinvestigation of the holotype also revealed toothed lobule margins (Fig. 2C, D View Figure 2 , indicated by white arrows) and the absence of acute lobe apices (Fig. 2B View Figure 2 , indicated by black arrow and dashed line). All lobes are gradually narrowed towards the apex or have a broadly rounded apex. The presence of rhizoids in the type material could not be ascertained.
Genus Protofrullania
No known copyright restrictions apply. See Agosti, D., Egloff, W., 2009. Taxonomic information exchange and copyright: the Plazi approach. BMC Research Notes 2009, 2:53 for further explanation.