VASCULAR PLANTS OF THE YANGTZE VALLEY 



7b. Leaf -blades foliaceous, of more than one layer of cells. 

 8a. Lvs. pseudo-dichotomously branched: sori exindusiate : 

 sporangia subsessile: annulus transverse, not inter- 

 rupted by stalk 10. 



8b. Lvs. simple or compound, usually pinnately compound, 



never dichotomously forked: sori marginal or on the 



back of lvs., with or without indusia: sporangia 



long-stalked; annulus interrupted by the stalk. 



9a. Sori marginal or submarginal. 



10a. Lvs. linear, grass-like: sori in a continuous marginal 



groove 19. 



10b. Lvs. not simple and linear. 

 11a. Sori protected by the reflexed margin of the If. .. 17. 

 lib. Sori not protected by the reflexed margin. 

 12a. With indusia. 

 13a. Indusia cup-like. 



Rhizome provided with large peltate multi- 

 cellular scales: indusium opening at the 

 end or at sides as well as at the end... 16. 

 Rhizome with hairs of 1 cell-row or very 

 narrow scales only 2-3 cells wide at 

 base: indusium opening at the end. .. 15. 

 13b. Indusia reniform. 



Pinnae articulate to the rachis 



Pinnae not articulate to the rachis 24. 



12b. Without indusia. 



Lvs. and rhizomes without scales or true hairs. 21. 



Lvs. pubescent 



9b. Sori dorsal. 

 14a. Sori linear. 



15a. Indusia present. 



Sori parallel to midribs of pinnae and pinnules, 



straight 22. 



Sori parallel to veins, oblique to midribs of 

 pinnae and pinnules, straight, curved, or 



reniform 20. 



15b. Indusia absent. 

 16a. Sporangia following the veinlets, reaching from 



near costa to near margin 18. 



16b. Sporangia in definite sori, not borne along every 

 veinlet. 

 17a. Sori parallel to midrib: lvs. narrow, linear. 



With stellate hairs on lamina 



Without stellate hairs 19. 



17b. Sori oblique to midrib, parallel to veins. 



Lvs. alternate, not crowded, internodes may 



be long or short 25. 



Lvs. fasciculate, i.e. closely crowded on the 

 short rhizome. 



Lf . blades pubescent 



Lf . blades glabrous 



14b. Sori round, or reniform. 

 18a. Indusia absent. 



Veins free: scales non-clathrate 



6 



Gleicheniaceae 



Vittariaceae 

 Pteridaceae 



Davalliaceae 



Dennstaedtiaceae 



Nephrolepis 

 Aspidiaceae 



Monachosoraceae 

 Thelypteris 



Blechnaceae 



Aspleniaceae 



Gymnogrammaceae 



Saxiglossum 

 Vittariaceae 



Polypodiaceae 



Leptogramma 

 Cornopteris 



Thelypteris 



