foc
《中国植物志》英文修订版
Flora of China
  FOC Vol.2-3 (2013)              | Family List  Hymenophyllaceae  PDF     |  eFloras.org Link Font:+ Big | - Small
   10. Hymenophyllaceae  
膜蕨科   mo jue ke
  
Authors:Authors: Liu Jiaxi, Zhang Qiaoyan, Atsushi Ebihara & Kunio Iwatsuki

  

Plants epiphytic, petrophilous, or terrestrial, small to medium-sized. Rhizome sometimes short and erect, but usually slender and long creeping, often covered with hairs when young, simple or sometimes irregularly branching. Lamina simple to pinnately decompound, or flabellate, digitate, dichotomous, or even irregularly divided. Segments with a single veinlet, cells in one layer, or rarely with 2-4 cell layers without intercellular spaces and stomata. Sori terminal on veins, solitary, at apex of ultimate segments, or marginal on simple to pinnatifid fronds; involucres cup-shaped to deeply 2-cleft nearly to base; receptacles terminating a vein, short, capitate or clavate, or long and projecting; sporangia shortly stalked to (sub)sessile, maturing basipetally; annulus oblique, not interrupted; dehiscence irregular; spores globose-trilete, tetrahedral, containing chloroplasts, usually short-lived. x = 8, 11, 12, 13, 17, 21, 22, 26, 28, 36, 54 (base numbers x = 8, 54 are doubtful).

Nine genera and ca. 600 species: tropical, subtropical, and temperate regions of both the Old and New Worlds; seven genera and 50 species (six endemic) in China.

Traditionally, only two genera-Hymenophyllum with bivalved involucres and Trichomanes Linnaeus with tubular involucres-have been recognized in this family. This scheme was expanded by Morton (Contr. U.S. Natl. Herb. 29: 139-202. 1968) who hierarchically placed many subgenera, sections, and subsections under two larger genera, Hymenophyllum and Trichomanes, and recognized four monotypic genera, Cardiomanes Morton, Serpyllopsis Morton, Hymenoglossum Morton, and Rosenstockia Morton, all of which have specialized fronds. Conversely, Copeland (Gen. Fil. 31-44. 1947) split the family into 34 genera, basing his work on herbarium specimens as well as his field observations of Asian material. Taking into account these past studies plus recent investigations including molecular data, Ebihara et al. (Blumea 51: 221-280. 2006) proposed a modern scheme of classification on which the system of this treatise is based.

Ching Ren-chang, Fu Shu-hsia, Wang Chu-hao & Shing Gung-hsia. 1959. Hymenophyllaceae. In: Ching Ren-chang, ed., Fl. Reipubl. Popularis Sin. 2: 132-196, 350-357, 379.

  
1Rhizomes shortly creeping or erect(2)
+Rhizomes long creeping(6)
   
2(1)Fronds once pinnate to bipinnatifid.3  Cephalomanes    厚叶蕨属
+Fronds bipinnate or more divided(3)
   
3(2)Stipes and rachises with long bristlelike light reddish hairs(4)
+Stipes and rachises without long bristlelike light reddish hairs(5)
   
4(3)Laminar cells reduced, less than 3 rows of cells between midribs and margins.1  Abrodictyum    长片蕨属
+Laminar cells not reduced, more than 3 rows of cells between midribs and margins.2  Callistopteris    毛杆蕨属
   
5(3)Laminar cell walls thin and straight; fronds usually more than 25 cm.4  Crepidomanes    假脉蕨属
+Laminar cell walls slightly thick or very thick, wavy or pitted; fronds usually less than 25 cm.1  Abrodictyum    长片蕨属
   
6(1)Rhizomes subglabrous or with sparse light-colored hairs; involucres usually bivalvate.5  Hymenophyllum    膜蕨属
+Rhizomes covered with reddish to dark-colored hairs; involucres usually not bivalvate(7)
   
7(6)Roots absent or replaced by rootlike shoots(8)
+Roots present(9)
   
8(7)Continuous false veinlets parallel to true veins present; blade venation catadromous.6  Didymoglossum    毛边蕨属
+Continuous false veinlets parallel to true veins absent; blade venation anadromous.4  Crepidomanes    假脉蕨属
   
9(7)Stipes and rachises with minute clavate hairs.7  Vandenboschia    瓶蕨属
+Stipes and rachises without minute clavate hairs.1  Abrodictyum    长片蕨属
   
   Lower Taxon
  • Abrodictyum  C. Presl  长片蕨属
  • Callistopteris  Copeland  毛杆蕨属
  • Cephalomanes  C. Presl  厚叶蕨属
  • Crepidomanes  C. Presl  假脉蕨属
  • Didymoglossum  Desvaux  毛边蕨属
  • Hymenophyllum  J. Smith  膜蕨属
  • Vandenboschia  Copeland  瓶蕨属