482 HYDEOPTERIDEAE [CH. 



represented in fig. 327, B, are described by Zigno^ from Jurassic 

 beds of Italy as S. angustifolia and by Moeller'' from the Jurassic 

 of Bornholm as S. Phillipsi f. pusilla. A coarser type of 

 venation than that of S. Phillipsi is occasionally found in 

 Jurassic examples, as in S. grandifolia Font.' from Oregon and 

 S. Nathorsti Barth. from Bornholm^ 



Sagenopteris is recorded also from several Rhaetic floras. 

 The best known species, 8. rhoifolia PresP, is hardly dis- 

 tinguishable from some forms of S. Phillipsi or from the Italian 

 Jurassic species described by Zigno as 8. Goeppertiana", though 

 the leaflets are usually rather larger. This species was first 

 described by Brongniart as Filicites Nilssoniana'' , and a few- 

 authors* have adopted this specific name because of its priority 

 over Presl's designation. As Nathorst remarks, to give up 

 the well-known name >S. rhoifolia for 8. Nilssoniana is " mere 

 pedantry." The epidermis of 8. rhoifolia as figured by Schenk' 

 consists of cells with straight and not undulating walls: 

 stomata occur on the lower surface (fig. 326, B). 



Rhaetic leaves of the type represented by 8. rhoifolia have 

 a wide geographical distribution. 



The specimens described by Feistmantel from the Damuda 

 series of India as 8agenopteris longifolia are no doubt fronds 

 of Olossopteris longifolia^". 



The Wealden species Sagenopteris Mantelli (Dunk.)" agrees 

 closely in habit and in the form of the leaflets with >S. Phillipsi 

 and 8. rhoifolia. It is probable that some of the leaves 

 described by Velenovsky'^ from Lower Cretaceous rocks in 

 Bohemia as Thinnfeldia variabilis are portions of 8agenopteris 

 fronds. 8. Mantelli is recorded from several European localities, 

 from California ", and elsewhere. 



1 Zigno (56) A. PI. XXI. 2 Moeller (02) PI. vi. figs. 8, 9. 



3 Ward (05) PI. xv. fig. 5. 



■» Bartholin (92) PI. v. fig. 9. ' Presl, in Sternberg (38). 



s Zigno (56) A. Pis. xxi. xxii. ; Baciborski (94) A. PL xx. figs. 13—18. 



7 Brongniart (25) PL xii. fig. 1. 



8 Fontaine, in Ward (05); Salfeld <09) PL i. » Schenk (67) A. Pi. xin. 

 " Arber (05) p. 75. u Seward (942) a. p. 130. i^ Velenovsky (85) PL ii. 

 " Fontaine, in Ward (05) PL lxv. Newberry's Chiropteris spatulata from 



Montana may be founded on leaflets of Sagenopteris Mantelli. Newberry (91). 



