Hypodematium confertivillosum
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Ordo: Polypodiales
Familia: Hypodematiaceae
Genus: Hypodematium
Name
Hypodematium confertivillosum J.X.Li, F.Q.Zhou & X.J.Li sp. nov. – Wikispecies link – Pensoft Profile
Diagnosis
Hypodematium confertivillosum J. X. Li, F. Q. Zhou & X. J. Li is similar to H. crenatum (Forssk.) Kuhn & Decken and H. glanduloso-pilosum (Tagawa) Ohwi, from which it differs greatly by its abaxial fronds sparsely covered with rod-shaped glandular hairs, its adaxial fronds without rod-shaped glandular hairs and spore reniform, with verrucate processes, surface with distinct finely lamellar rugae ornamentation.
Type
China. Shandong Province: Linyi City, Fei County, Tashan Mountain, limestone rocks, 35°33'59.76"N, 117°51'29.51"E, 500–700 m a.s.l., 15 September 1982, J. X. Li 02025 (Holotype: PE, Isotype: SDCM). Figure 1.
Description
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.
Distribution
This species is known only from the area around the type locality in Tashan, Shandong.
Ecology
Usually growing in limestone crevices of xeric areas.
Discussion
The perispore is an important trait for identifying species under the scanning electron microscopy (Liu and Li 1999[1]) and it contributes to the discovery of some new species, for example Dryopteris guanchica (Jermy 1980[2]). There are significant differences between the perispore of H. confertivillosum that has verrucate processes, surface with distinct finely lamellar rugae ornamentation, H. crenatum having curved long ridges, surface with fine striae ornamentation and H. glanduloso-pilosum having tuberculate-massive ornamentation, providing an important micromorphological basis for establishment of the new species H. confertivillosum. A comparison of H. confertivillosum, H. crenatum, and H. glanduloso-pilosum is given in Table 1 and Figure 2.
| Species name | Size (μm) | Ornamentation of perispore SEM | Locality and voucher | Figure 2 |
|---|---|---|---|---|
| H. confertivillosum | 40.8×52.6 | Verrucate processes, surface with finely lamellar rugae | Shandong J.X. Li 02025 PE | A–D |
| H. crenatum | 46.1×50.3 | Curved long ridges, surface with fine striae | Guangxi R.H. Zhou 0013-1 PE | E–F |
| H. glanduloso-pilosum | 48.2×53.6 | Tuberculate-massive | Shandong J.X. Li 96-035 SDCM | G–H |
| Species name | Adaxial fronds | Abaxial fronds | Rachis and costae | Indusia | Holotype, voucher and gatherer | Figure 3 | ||||
|---|---|---|---|---|---|---|---|---|---|---|
| Non-glandular hairs | Glandular hairs | Non-glandular hairs | Glandular hairs | Non-glandular hairs | Glandular hairs | Non-glandular hairs | Glandular hairs | |||
| H. confertivillosum | 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 J. X. Li 02025 | A–D |
| H. crenatum | 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 R. H. Zhou 0013-1 | E–H |
| H. glanduloso-pilosum | 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 J. X. Li 96-035 | I–L |
Original Description
- Li, X; Li, J; Meng, F; 2018: A new species of Hypodematium (Hypodematiaceae) from China PhytoKeys, (92): 37-44. doi
Images
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Other References
- ↑ Liu J, Li Y (1999) Study on the spore morphology of Cystopteris Bernh from Beijing. In: Shing K (Ed.) Ching Memorial Volume. China Forestry Publishing House, 328–330.
- ↑ Jermy A (1980) Biosystematic studies of Dryopteris. Acta Phytotaxonomica Sinica 18(1): 37–44.
- ↑ 3.0 3.1 Zhang G, Iwatsuki K (2013) Hypodematium Kunze. Flora of China, Vol. 2-3. Science Press, Beijing & Missouri Botanical Garden Press, St. Louis, 535–539.
