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30. Blechnaceae

乌毛蕨科 wu mao jue ke

Authors: Wang Faguo, Prof. Fuwu Xing, Shiyong Dong & Masahiro Kato

Plants mostly terrestrial, sometimes tree ferns (like small trees), rarely scandent. Rhizome mostly erect, or creeping or scandent, usually dictyostelic (Stenochlaena meristelic), scales brown, entire. Fronds monomorphic or dimorphic, mostly long stipitate; stipe with 2 to several vascular bundles, scaly at base; lamina pinnate, pinnatifid, or bipinnatifid, rarely simple, thickly papery to leathery, glabrous or usually with small scales; pinnae rarely articulate to rachis (Stenochlaena); veins free or anastomosing with 1 or more series of areoles, without included free veinlets. Sori elongate or continuous along vascular network or commissure on either side of midrib, indusiate, rarely exindusiate, rarely acrostichoid; indusium facing toward costa or costule; annulus longitudinal, interrupted. Spores elliptic, bilateral, monolete.

About (2-)14 genera and ca. 250 species: worldwide, but with greatest diversity in the S tropics; eight genera and 14 species (one endemic) in China.

Stenochlaena has been separated as the sole genus of Stenochlaenaceae or Blechnaceae subfamily Stenochlaenoideae. Christenhusz et al. (Phytotaxa 19: 48-49. 2011) listed seven genera of Blechnaceae but indicated that the actual number of genera was very uncertain and could be anywhere between two and nine, depending mainly on a better understanding of Blechnum.

Shing Kunghsia. 1990. Stenochlaenaceae. In: Ching Renchang & Shing Kunghsia, eds., Fl. Reipubl. Popularis Sin. 3(1): 94-97; Wu Shiew-hung. 1999. Blechnaceae. In: Wu Shiew-hung, ed., Fl. Reipubl. Popularis Sin. 4(2): 192-215.

1 Tree ferns with erect trunklike stem, up to ca. 1 m tall   (2)
+ Rhizome creeping to suberect; plants not like tree ferns   (3)
2 (1) Stem 1-2 cm in diam.; lamina bipinnatifid; sori indusiate, discrete.   4 Diploblechnum
+ Stem 10-15 cm in diam.; lamina pinnate; sori exindusiate, covering pinna surface.   5 Brainea
3 (1) Sori acrostichoid with sporangia covering entire abaxial surface of fertile pinna; pinnae articulate at junction with rachis; rhizome scales peltate, ca. 1 mm, caducous.   8 Stenochlaena
+ Sori distinct, covered by indusia when young; pinnae not articulate; rhizome scales basifixed, 4 mm or more, often persistent   (4)
4 (3) Sori at least partially discrete, parallel to costules and sometimes also costae and rachis   (5)
+ Sori forming continuous coenosori along costa of lateral pinnae   (6)
5 (4) Rhizome short and erect; stipes tufted; pinnae separate, rachis terete; sori in lines parallel to costules, discrete.   6 Woodwardia
+ Rhizome creeping; stipes distant; pinnae connected by narrow wing along rachis; sori along rachis and costae almost continuous, those along costules ?discrete.   7 Chieniopteris
6 (4) Plants epiphytic or epilithic; fronds distant; veins anastomosing.   2 Blechnidium
+ Plants terrestrial; fronds clustered; veins free   (7)
7 (6) Fronds monomorphic; pinnae broad.   1 Blechnum
+ Fronds dimorphic; fertile pinnae very narrow, almost absent.   3 Struthiopteris

Lower Taxa


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