71. POLTi*ODIUM. § 6- PLEOPELTIS. b**- PLEmiDltlM. 645 



e.e. Rhizome scales fihrillose, fervugineous, 



(169) P. rhynchophyllum. 



C.C. Barren fronds hardly shorter than the fertile ones,\or more than 



\10 cm. long in the adult plant. (170) P. Griffithianum. 



h.h. Sori + immersed, round. ' (I'^l) P- Whitfordi. 



6.6.6. Sori + immersed, oblong. 



^. Son oblique to the costa. (172a) P. Treubii. 



^.■^. Sori parallel to the costa. (1726) P. Valetonianum. 



a.a. Sori in i row between the main veins, free or confluent. (') 



±. Upper surface of the fronds copiously covered with white dots. 



(175) P. platyphyllum. 

 1.1. Upper surface of the fronds without white dots. 



2. Texture membranaceous. (1'4) P. campy loneuroides. 



S.9. Texture rather coriaceous. 



3. Fronds small, under i2\ c.M. long. Main veins erecto-palenl. 



(175) P. phlebiscopum. 

 3.3. Fronds larger, more than i2% c.M. long. 



^. Main veins + horizontal. (176a) P. hemionitideum. 

 ^.if.Main veins oblique. (1766) P. Werneri. 



a.a.a. Sori in 2 rows between the main veins, i to several in a row. 

 v. Texture membranaceous or herbaceous to papyraceous. 



>(<. Stipes distant. (f) P- Zippelii. 



i(.. if:. Stipes approximate. (1'8) P. membranaceum. 



v. v. Texture chartaceous to coriaceous. 



c'. Upper surface of the fronds covered with white dots. 



(179) P. leucophorum. 

 c'.c'. Upper surface of the fronds without white dots. 



; d'. Rhizome scales proportionally short and broad, blunt. 

 I -, ^ _(180)JL_iricL!ietum. 



c'. Ehizome scales acuminate or acute. 



f. Sori 4 — 8 in a row. (181a) P. rupestre. 



f'.f'.Sori 1—3 in a,row^_^ ^ (1816) P. liizoiiicum. 



j ^.e'.Bhizome scales aristate or cuspidate, f^g^y-p aHui^m^ 



u.a.a.a, Sori scattered irregularly, free or sometimes confluent. (^) 



(') See also § 7, SelUgnea. 



(*) See also P. membranaceiim, Don, ZlppelU; Bl, & leucophorum, Bk. 



