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FOC | Family List | FOC Vol. 2-3 | Polypodiaceae | Drynaria

2. Drynaria bonii Christ, Notul. Syst. (Paris). 1: 186. 1909.

团叶槲蕨 tuan ye hu jue

Drynaria meeboldii Rosenstock.

Rhizome shortly creeping, terete to dorsiventrally flattened, ca. 3 mm thick, 1-2 cm wide; scales squarrose or spreading from an appressed base, peltate, 2-12 × 1.5-3 mm, abruptly contracted from a broad base, often with a distinct, brown midrib, margin irregularly and shortly dentate at base, acumen often subulate and subentire; fronds dimorphic, glabrous; basal fronds contiguous or overlapping, often completely covering and surrounding rhizome, sessile, (4-)10-15 × (3.5-) 8-12 cm, subentire to shallowly lobed; foliage fronds stalked, stipe up to 20 cm, conspicuously winged with a sinuous wing; lamina pinnatifid up to ca. 1 mm from costa, 30-70 × 20-30 cm, apex aborted; pinnae 3-7 pairs, slightly ascending, 1.5-3 cm distant, broadly lanceolate, 7-20 × 2.5-5 cm, base slightly narrowed and decurrent, margin subentire to shallowly sinuate, apex obtuse to long acuminate. Sori in 2 irregular rows between costa and margin, 2-4 rows between lateral veins. Spores with spines.

Epiphytic or epilithic on dry or muddy rocks in deciduous forests at low to middle elevations, fairly common on limestone rocks; 100-1300(-1700) m. Guangdong, Guangxi, Guizhou, Hainan, Yunnan [Cambodia, India, Malaysia, Thailand, Vietnam].

Drynaria bonii has been wrongly identified as D. sparsisora (Desvaux) T. Moore (Polypodium sparsisorum Desvaux; P. linnei Bory; D. linnei (Bory) Beddome), a species of SE Asia and Australia, which differs by the basal fronds more deeply lobed, up to 1/3, and rhizome scales with a very long acumen.


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