Underwood : The Genus Phanerophlebia 209 



row slender lanceolate scales: pinnae 1-5 (in one rare case to), 

 the terminal much the largest, 6-10 cm. long, 2.5-2.8 cm. wide, 

 the lateral 3-3.5 cm. long, 2-2.5 wide, all cordate at the base, 

 the terminal normally acute, the lateral mostly obtuse except for 

 the terminal spine ; margins with projecting spines i mni. long : 

 sori in two usually complete rows with occasionally scattering out- 

 liers, the inner row 1-3 mm. from midrib, the second row 2-3 

 mm. farther out : veins free, 2-4 times forked, the sori borne 

 mostly on the middle of the alternating branches. , 



Mexico lOaxaca : Galeotti, 6251]. Oiiapas : Ghicsbreght 



(K, G, E, U); Linden, 1552 (K)- 



There appears to be considerable variation in the number of 

 pinnae though the predominating number is 3 as seen by the fol- 

 lowing .series examined : 



Ghicsbreght (Hb. Eaton) I, 2, 3, 3, 3, 3, 3, 3-4; (Hb. Gray) 

 3, 5, 5, 10* ; (Hb. Underwood) 2, 4 ; (Nat. Herb.) 5 ; (Hb. Kcw) 

 3, 3. 3, 5, 5,*5- 5 ; Lii-^Jen (Hb. Kew) 3, 3, 3, 3. 



The relation of this species to P. Lindciii is not clear. Of the 

 latter I have seen only the Kew specimen (Chiapas, Linden, 1551) 

 which is represented by two leaves with the following measure- 

 ments : terminal pinnae 14x3 cm., lateral 9x2.3 cm., the termi- 

 nal remote (2.5-3 cm.) from the lateral, all the pinnae taper- 

 pointed, f In one of the leaves there is an aurlculate base on each 

 lateral pinna. In Eaton's specimen of P. puinila there is a single 

 leaf strikingly similar to Linden, 1551, but smaller and totally un- 

 like any of the other specimens of the sheet. This leaf is discon- 

 nected from the other specimens, so may belong to a different plant 

 from the rooted specimen ; Its dimensions are : stipe 17 cm., termi- 

 nal 10 X 2.3 cm., lateral 6.5 x 1.7 cm. While there is no question 

 that we have in P. pmiiila a species totally distinct from any other 

 of the group, only field work will determine whether we do not 

 also have two. In other words P. Lindciii may be a distinct species. 



3. Phaxekopiileuia remotispora Fourn. Mex. Plantas I : lOO. 



1872. 



Rootstock unknown: stipes 35-40 cm. long, stramineous, 



*Tliis leaf, ^vhich is separate from the other three which constitute the specimen, is 

 also peculiar in showing broadly obtuse almost truncate bases to the lateral pinnae and 

 an acute apex and with a falcate upper curve. 



tit should be noticed that the pinnx of Linden's 1552 are more acute than in 



hiesbreght's specimens. 



