Homaliodendron maolanense J.Yang, F.M.Lei, R.L.Huang, Y.C.Zhang, L.He, S.L.Guo, J.Yu & D.D.Li, 2025

Homaliodendron maolanense J.Yang, F.M.Lei, R.L.Huang, Y.C.Zhang, L.He, S.L.Guo, J.Yu & D.D.Li , sp. nov. ( Fig. 2 View FIG )

TYPE MATERIAL. — China • Guizhou Province, Libo County, Maolan National Natural Reserve, Forest of Stone Scenic Spot ; on rocks; 874 m alt.; 25°17’31.41”N, 107°56’16.75”E; 04.XII.2018; leg. J. Yang et al. 1-20181204-005 ( holotype: SHTU!; GoogleMaps isotype: KUN!) GoogleMaps .

ETYMOLOGY. — The specific epithet indicates the type locality: Maolan, Libo County, Guizhou Province, China.

HABITAT. — Growing on rocks under broadleaved forest, along roads.

DIAGNOSIS. — Similar to Homaliodendron pulchrum , but differing in having strongly falcate, asymmetrial leaves widest in midleaf, apices with irregularly biserrate teeth, and costae distinctly double.

DESCRIPTION

Plants medium to large-sized, to 10 cm long, strongly flattened, frondose, mostly with glossy, green or yellowish green, becoming tawny with age. Primary stems prostrate, with few reddish rhizoids, secondary stems erect, bipinnately or tripinnately branched, with few foliose pseudoparaphyllia. Central strand absent, outer cortex of 6-8 layers of thick-walled collenchymatous cells, inner cortex of thin-walled parenchymatous cells. Stipe leaves oblong-spathulate to obovate, obtuse at apices, 2.9-3.3 mm long, decurrent; costae double, short, distinct. Stem leaves, 2.3-3.3 mm, horizontally spreading, very asymmetric, strongly falcate, ovate-spathulate, with widest part at the middle, 0.85- 1.45 mm wide, strongly tapered to base, 0.35-0.55 mm at base; apex truncate or apiculate, irregularly biserrate with 6-12 sharp teeth, the terminal tooth curved, larger than the others, 0.2-0.28 mm long, multicellular, coarse and blunt, entire below; often inflexed on one side at base; costae double, disitinct; cells strongly incrassate, smooth, round to longly rhomboidal, 4-8 × 10-18 µm at tip and margin, gradually longer below, 5-10 × 16-38 µm in mid-leaf, 5-9 × 35-95 µm at base near costa, basal leaf cells distinctly porose, at margin becoming smaller, shortly rhomboid to irregular rectangular. Branch leaves similar to stem leaves in shape, but smaller in size, 2.0- 2.5 mm long, strongly falcated, costae double, dentate at the apex, with widest part at the middle, 0.75-0.90 mm wide, 0.32-0.34 mm at base; cells similar to those of stem leaves but smaller. Sporophytes not seen.