40. PLAGIOGYRIA. 341 



Rhizome erect. Stipes clustered, adherent to the rhizome, the base 

 abruptly dilated, bearing on the outer side generally ± 2—12 spongy tubercles 

 or projections. Fronds simply pinnate, dimorphous; barren pinnae linear-lanceo- 

 late, fertile ones much contracted, linear. Diels, in Engl. & Prantl, Nat. Pfl. 

 Pam., I*, fig. 149. 



Eastern Asia, Tropical America. 



a. Pinnae of barren fronds adnate to the rachis by a. broad base. 



*. Fronds ± 20—25 c.M. long, ± 6—7% c.M. broad, submembrana- 



<^«ous. . (1) p, stenoptera 



*.*. M-onds ± 30—45 c.M. long, ± iO—15 c.M. broad, subcoriaceom. 



(2) P. adnata 

 a.a. At least the lower pinnae of barren fronds not adnate to the rachis. 



b. Tubercles wanting on the stipes at the base. (3) P. Christii. 



b,b. Tubercles present. 



c. Pinnae of barren fronds glaucous or while-powdery beneath. 



(4) P. glauca. 

 c.c. Pinnae of barren fronds not glaucous, nor powdery beneath. 

 d. Pinnae of barren fronds + truncate at the base. 



(S) P. pycnophylla. 

 d.d. Pinnae of barren fronds narrowed at the base. 



e. Barren pinnae serrate throughout. (6) P. euphlebia. 



e.e. Barren pinnae serrate towards the apex only, otherwise 



entire. , (7) P. tuberculata. 



(1) I*, stenoptera, mels, Copel., Philipp. Journ., I, Suppl., 154; 

 Blechnum stenopterum, Hance, Journ. of Bot., XXI, 268 ; Lomaria concinna, Bk., 

 Jonrn. of Bot., XXIII, 103; L. stenoptera, BL, Ann. of Bot., V, 220. 



Rhizome short, erect. Stipes tufted, greenish, nearly naked, 10 — 25 c.M. 

 long, basal tubercles present, the fertile fronds on the longest stipes. Bai-ren 

 fronds oblong-lanceolate, 20—25 c.M. long, G—1\ c.M. broad. Pinnae + 

 20 on a side, lanceolate, contiguous, adnate by a dilated base, + 7'/j m.M. 

 jroad, acute, minutely denticulate. Texture nearly membranaceous; surfaces 

 laked; veins distinct, simple or forked. Fertile fronds with the pinnae less 

 lumerous, remote, linear. 



Luzon; Formosa, China. 



