向日鳞始蕨 xiang ri lin shi jue

Lindsaea lobata Poiret var. hainaniana K. U. Kramer, Gard. Bull. Singapore 26(1): 37. 1972.

Rhizomes shortly creeping, sparsely scaly; scales slightly spreading, brown, 2 or 3 cells wide at base and acicular at apex. Fronds approximate; stipe stramineous or sometimes brown, 10-25 cm, quadrangular; lamina 20-30 × 10-15 cm, herbaceous, 2-pinnate, consisting of a long terminal pinna and 1 or 2(or 3) pairs of short lateral pinnae, or sometimes without lateral pinnae, linear when 1-pinnate or trifurcate to ovate when 2-pinnate; pinnae linear, lateral pinnae 0-2(or 3) pairs, with 35-40 pairs of pinnules on terminal or central pinnae, 15-25(-35) pairs on lateral pinnae, pinnules not reduced toward base but gradually becoming smaller toward apex, dimidiate and oblong, lobed on upper margin, incisions reaching to 1/3-1/2 pinnule width, apex rounded, ultimate lobes convex at apex; veins anastomosing, evident on both surfaces. Sori marginal, terminal on 2 to many united veins; indusia linear, interrupted. 2n = 94*.

● Terrestrial, forests; 700-1200 m. Hainan.

Lindsaea hainaniana is morphologically very similar to L. lobata var. lobata, differing only in the upper pinnules being gradually reduced in L. lobata var. lobata but ± suddenly reduced in L. hainaniana. A recent molecular analysis (Lehtonen et al., Bot. J. Linn. Soc. 163: 305-359. 2010) found, however, that L. lobata in the traditional sense was polyphyletic and this resulted in the recognition of the variety at the species level. Lindsaea hainaniana also resembles L. cultrata, from which it mainly differs in having wider rhizome scales and upper margins of the pinnae more deeply lobed.