河口毛蕨 he kou mao jue

Christella hokouensis (Ching) Holttum; Thelypteris hokouensis (Ching) C. F. Reed.

Plants 0.8-1.3 m tall. Rhizomes long creeping, dark brown, including stipe bases with sparse dark brown lanceolate scales and brown setae. Fronds distant; stipes 10-15 cm, dark stramineous; laminae 70-120 × 20-35 cm, bases abruptly narrowed, apices caudate; pinnae 20-35 pairs, proximal 5-15 pairs abruptly reduced into hastate pinnae with caudate apices, proximal pair ca. 1 × 0.5 cm; middle pinnae linear-lanceolate, 10-18 × 1-2 cm, bases truncate, lobed 1/4-1/3 toward costae, apices long acuminate; segments 20-30 pairs on middle pinnae, oblong, 2-5 × ca. 3 mm, entire, subacute at apices; veinlets 8-11 pairs, proximal 2 or 3 pairs anastomosing, next 1-1.5 pairs running to sinus membrane. Laminae papery, brownish green when dried, with dense acicular hairs along costae on both surfaces, with several acicular hairs along veins adaxially, with dense acicular hairs throughout and several capitate glandular hairs abaxially. Sori orbicular, medial; indusia hairy. Sporangia with small reddish orange glands on stalks. Spores with short wings.

Semi-open forests, wet places in forests, forest margins; 100-1100 m. SW Guangxi, SE Yunnan [E India].

The type of Cyclosorus caii Ching ex K. H. Shing (FRPS 4(1): 346. 1999) has features intermediate between C. hokouensis and C. aridus. Only one gathering (3 sheets of the type) with rare fertile sori has been collected. This taxon might be a hybrid.