Corresponding author: Fanyun Meng (
Academic editor: T. Almeida
Li X, Li J, Meng F (2018) A new species of
Described in 1833,
The voucher specimens of the new species were collected from Tashan mountain, China and deposited in PE (herbaria acronyms according to
Scanning electron microscopy (
China. Shandong Province: Linyi City, Fei County, Tashan Mountain, limestone rocks,
Plants 21–32 cm tall. Rhizomes creeping; densely scaly together with stipe base, scales reddish-brown, lustrous, linear-lanceolate, 10–12 × 1–2 mm, membranaceous, margin subentire, apex acuminate. Fronds approximate; stipe stramineous, 7–17 cm × 1–1.2 mm, nearly glabrous upward; laminae pentagonal, 12–17 × 12–14 cm, 3-pinnate-pinnatifid, base round-cordate, apex acuminate and pinnatifid; pinnae 10–12 pairs, slightly oblique, lower 2 pairs sub-opposite, 3–4 cm apart, upper pairs alternate; basal pinnae largest, deltoid-oblong, 10–11 × 8–8.5 cm, 2-pinnate-pinnatifid, base cordate, pinnae tapered; pinnules 6–8 pairs, anadromous, alternate, slightly oblique, acroscopic ones smaller, proximal basiscopic pair largest, ovate-triangular, 5 × 2–3 cm, shortly stalked, base cuneate, pinnae tapered, pinnate-pinnatifid; ultimate pinnules oblong, 8–10 × 4–6 mm, apex obtuse, pinnatifid; lobe oblong, apex obtuse, margins obtuse-serrate; second and upper pairs of pinnae gradually shorter, lanceolate or oblong-lanceolate, 2-pinnate-pinnatifid, base rounded-cuneate or shallowly cordate, with a short stalk, apex shortly acute. Veins obvious on both surfaces, pinnate, simple, ending at margin. Laminas chartaceous, fronds densely covered with long grey hairs adaxially, fronds abaxial surface, rachis and costae densely covered with long grey hairs and sparsely mixed with rod-shaped glandular hairs. Sori round, dorsal, 1–4 per segment; indusia reniform, pale grey, membranaceous, densely covered with grey hairs. Spores reniform, with verrucate processes, surface with distinct finely lamellar rugae ornamentation.
This species is known only from the area around the type locality in Tashan, Shandong.
Usually growing in limestone crevices of xeric areas.
The perispore is an important trait for identifying species under the scanning electron microscopy (
Spore morphologies of three
Comparison of spore morphological features amongst three species of
Species name | Size (μm) | Ornamentation of perispore |
Locality and voucher | Figure |
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40.8×52.6 | Verrucate processes, surface with finely lamellar rugae | Shandong J.X. Li 02025 PE | A–D |
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46.1×50.3 | Curved long ridges, surface with fine striae | Guangxi R.H. Zhou 0013-1 PE | E–F |
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48.2×53.6 | Tuberculate-massive | Shandong J.X. Li 96-035 SDCM | G–H |
It is commonly believed that
The fronds and rachis of
Comparison of fronds and indusia in three species of
Species name | Adaxial fronds | Abaxial fronds | Rachis and costae | Indusia | Holotype, voucher and gatherer | Figure |
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Densely covered with long grey hairs | Absent | Densely covered with long grey hairs | Sparsely rod-shaped glandular hairs | Densely covered with long grey hairs | Sparsely rod-shaped glandular hairs | Densely covered with long grey hairs | Sparsely rod-shaped glandular hairs | Holotype |
A–D |
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Sparsely acicular hairs | Absent | Densely covered with long grey hairs | Absent | Densely covered with long grey hairs | Absent | Densely covered with long grey hairs | Absent | Voucher |
E–H |
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Densely covered with acicular hairs | More rod-shaped glandular hairs | Densely covered with long grey hairs | Densely covered with rod-shaped glandular hairs | Densely covered with long hairs | Densely covered with rod-shaped glandular hairs | Densely covered with grey hairs | Densely covered with rod-shaped glandular hairs | Voucher |
I–L |
1 | Fronds not covered with rod-shaped glandular hairs adaxially |
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– | Fronds covered with rod-shaped glandular hairs and long grey hairs on both surfaces; perispore with tuberculate-massive ornamentation |
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2 | Fronds sparsely covered with rod-shaped glandular hairs abaxially; perispore with verrucate processes, surface with finely lamellar rugae ornamentation |
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– | Fronds not covered with rod-shaped glandular hairs abaxially; perispore with curved long ridges, surface with fine striae ornamentation |
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This work was supported by the Standardisation Construction of Traditional Chinese Medicine on