44 GINKGOALES [CH. 



Fontaine speaks of the lamina of his species as reaching a length 

 of 25 cm. ; both in the method of division and in the form of the 

 segments, B. multifida agrees closely with the specimen shown in 

 fig. 648. A similar form of leaf is figured by Solms-Laubach 1 

 from Rhaetic beds in Chile as Baiera ? Steinmanni, but the lamina 

 only is preserved. Schenk's B. taeniata 2 from the Rhaetic flora 

 of Franconia is another similar type. 



Baiera stormbergensis Seward. 



The specimens described from the Stormberg series (Rhaetic) 

 of South Africa 3 are portions of leaves that must have reached a 

 length of 12 cm. or more and a breadth of 10 cm. The lamina is 

 deeply divided into broad linear segments which are further 

 subdivided into narrower distal segments. In the lower part of 

 the lamina the venation is comparatively coarse, but as the result 

 of repeated dichotomy the veins are much more numerous in the 

 upper portion. This species may be merely a larger form of 

 Feistmantel's B. Schenki* from the same beds, in which the lobes 

 are narrower as in B. longifolia Heer. B. stormbergensis resembles 

 Nathorst's B. spectabilis from the Rhaetic of Scania, but the 

 segments of the South African leaves have a coarser venation. 



Baiera Muensteriana (Presl). 



This Rhaetic species, originally figured by Presl as Sphaero- 

 coccites Muensterianus and subsequently described by Braun as 

 Baiera dichotoma, was named by Schenk Jeanpaulia Muen- 

 steriana. Schenk 5 examined Braun's specimens from Franconia 

 and identified the supposed sporocarps as partially expanded 

 segments of foliage-leaves. The leaves are petiolate and the fan- 

 like lamina is deeply dissected into bifurcate linear segments ; 

 the veins are numerous and dichotomously branched. The epi- 

 dermal cells are elongate over the veins and elsewhere polygonal ; 

 their walls are straight or slightly sinuous. The stomata are of 

 the usual type met with in Ginkgoaceous plants. 



Baiera Muensteriana cannot be distinguished by any definite 

 character from leaves that are referred to B. gracilis: in the 



1 Solms-Laubach (99) PI. xiv. fig. 1. 



2 Schenk (67) A. p. 26, PL v. figs. 1-4; PL vi. figs. 1, 2. 



3 Seward (03) B. p. 64, PL vm. fig. 3. 



4 Feistmantel (89) p. 72, PL m. 5 Schenk (67) A. p. 39, PL ix. 



