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FOC | Family List | FOC Vol. 2-3 | Thelypteridaceae

15. Stegnogramma Blume, Enum. Pl. Javae. 2: 172. 1828.

溪边蕨属 xi bian jue shu

Authors: Youxing Lin & Kunio Iwatsuki

Plants medium-sized, on soil. Rhizomes short, erect or ascending, with dense unicellular or multicellular long hairs and sparse brown setaceous lanceolate scales. Fronds clustered; stipes dark brown, bases scaly and with grayish white unicellular or multi-separated acicular long hairs; laminae oblong-lanceolate or broadly lanceolate, not narrowed to bases or slightly so, 1-pinnate, pinnatifid-acuminate at apices; pinnae ca. 10 pairs, spreading, sessile or very shortly stalked on proximal several pairs, distal ones ± adnate to rachises, lanceolate or ovate-lanceolate, rounded-cuneate or truncate at bases, subopposite, undulate or crenate along margins, or lobed to 1/3 of distance to costule, shortly acute or rounded-obtuse at apices, sometimes acuminate, both surfaces ± with hairs, costae obviously raised abaxially, grooved adaxially, with dense acicular hairs. Veins goniopteroid, 3-5 pairs of veinlets per segment, proximal 1-3(-5) pairs joining to form triangular areoles, proximal pair arising above bases of costules, distally veins all reaching margin above sinuses. Laminae herbaceous, dark brown-green when dry, abaxially with grayish white acicular hairs, adaxially sparsely setaceous; usually with multicellular long hairs and short hairs along rachises. Sori linear, attached along veins, exindusiate or sometimes indusiate; sporangia bearing erect short hairs, sometimes glabrous; spores bilateral, elliptic, sharply echinate.

More than ten species: SW China, India, Malesia, Myanmar, Vietnam; six species (five endemic) in China.

1 Veinlets 3 or 4 pairs, joined on both sides of costules and forming 2 lines of tetragonal areoles.   1 S. dictyoclinoides
+ Veinlets 1 or 2 pairs joined on both sides of costules and forming 1-3 triangular or irregular areoles   (2)
2 (1) Sporangia glabrous.   2 S. xingwenensis
+ Sporangia bearing short hairs   (3)
3 (2) Laminae with many short setae remaining at attachments of sori after sori fallen.   3 S. cyrtomioides
+ Laminae with remaining glandlike objects at attachments of sori after sori fallen   (4)
4 (3) Pinnae broadly ovate-lanceolate, margins lobed to 1/3 of distance to costule, bases truncate, apices shortly acute, proximal 3 or 4 pairs of pinnae shortened and reflexed; endemic to Yunnan (Gongshan).   4 S. latipinna
+ Pinnae lanceolate, acuminate at apices, or ovate-lanceolate, rounded-obtuse, margins undulate or lobate, bases rounded-cuneate, proximal pinnae not or slightly shortened   (5)
5 (4) Proximal pinnae slightly shortened, lanceolate, broadest on mid to lower part, acuminate and bent distally, glabrous on intercostal areas of abaxial surface of pinnae; endemic to Chongqing (Jinyun Shan).   5 S. diplazioides
+ Proximal several pinnae shortened, narrowly ovate-lanceolate, broadest at bases, rounded-obtuse at apices, setaceous on intercostal areas of abaxial surface of lamina; Chongqing, Sichuan, Yunnan.   6 S. jinfoshanensis

Lower Taxa


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