﻿71. POLTPODIUM. § 6. PLEOPELTIS. b**. PLEURIDltM. 643' 



e.e. Rhizome scales fibrillose, ferrugineous. 



(169) P. rhynchophyllum. 



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



C.M. long. (170) P. Griffitliianum. 



b.b. Sori + immersed, round. (171) P. Whitfordi. 



b.h.h. Sori + immersed, oblong. 



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



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



a.a. Sori in i row between the main veins, free or confluent. {*) 



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



(175) P. platyphyllura. 

 1.1. Upper surface of the fronds without white dots. 



2. Texture membranaceous. (1'7'i) P. campyloneuroides. 



2.2. Texture rather coriaceous. 



3. Fronds small, under d2^l^ c.M. long. Main vdins erect o-patent. 



(175) P. phlebiscopum. 

 3.3. Fronds larger, more than d2% c.M. long. 



i^. Main veins + horizontal. (176ffl) P. hemionitideum. 



;^.>K.#am veins oblique. (176&) P. Werneri. 



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

 b'. Texture membranaceous or herbaceous to papyraceous. 



*. Stipes distant. (177) P. Zippelii. 



>|c.>(s.5'ftjoe*" approximate. (178) P. membranaceum. 



b'.b'. 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 blunt at the apex, pale-ochraceous. 



(180) P. Iriquetrum. 

 d'.d'. Rhizome scales acuminate or aristate at the apex. 

 e. Rhizome scales dark-brown, sometimes white. 



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



f'.f'.Sori i — 3 in a row. (1816) P. luzonicum. 



e'.c'. Rhizome scales pale-coloured, yellowish. (182) P. albulum. 

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



(') See also § 7, Sellignea. 



(*) See also P. membranaceum, Don, Zlppellj, Bl> & leucophorum^ Bit. 



