13 9 
Tree (Ginkgo biloba , Z.). 
genus Baiera and to leaves which some authors include in 
the genus Jeanpaulia. 
Trias sic. Among Triassic species referred to Baiera and 
Ginkgo , the following may be mentioned :—Baiera multifida, 
Font., from Virginia \ which bears a close resemblance to 
Salisburiapalmata , Ratte, from Australia 2 ; Ginkgo crenata 3 
(Brauns), from Steinstedt near Braunschweig; Baiera furcata , 
Heer, founded on a fragment from the Swiss Trias 4 ; Baiera (?) 
Steinmanni , Solms, from the Rhaetic of Chili 5 , similar to B. 
Schenki , Feist. 6 , from South Africa, and A. Virginiana , F. 
and Wh.; Baiera Munsteriana (Presl), A. taeniata , Schenk, 
from Germany 7 ; Ginkgo obovata , Nath., Z. minuta , Nath, 
(possibly a Fern ; cf. Rhacopteris sp.), Baiera Geinitzi , Nath., 
A. marginata , Nath., B. paucipartita, Nath., from Scania 8 . 
From the Ipswich rocks of Queensland, Shirley 9 has recently 
described several species of Ginkgo , e. g. Z. antarctica , Sap., 
Z. bidens , Ten-woods (very similar to Baiera gracilis , Bunb., 
from the Inferior Oolite of Yorkshire), Z. Simmondsi , Shir., 
and Baiera ginkgoides, Shir. 
Some of the best examples of Rhaetic species of Baiera have 
been described by Schenk. This author also describes and 
figures some fossils under the name Stachopitys Preslii 10 , which 
are no doubt male flowers, of which the stamens bear five or six 
pollen-sacs arranged as a verticil at the end of the filaments. 
Jurassic and Wealden. The genera Ginkgo and Baiera 11 are 
abundantly represented in Jurassic floras, and especially from 
European localities. We cannot attempt a critical examina¬ 
tion of all the described species, but must confine ourselves to 
the enumeration of most of the examples recorded from various 
latitudes. The drawings of Ginkgo leaves shown in PI. X, 
Figs. 62-66 and Fig. 70, illustrate the range of variation in the 
form of the lamina in the recent species, and serve as warnings 
I Fontaine (’83), Pis. XLV-XLVII. 2 Ratte (’87). 
3 Nathorst (78). 4 Heer (76). 5 Solms-Laubach (’99). 
6 Feistmantel (’89). 7 Schenk (’67) and (’87). 8 Nathorst (78). 
9 Shirley (’98). 10 Schenk (’67). 
II The genus Czekanowskia, frequently included in the same family with Ginkgo, is 
omitted as being in all probability but remotely connected with the recent genus. 
