unita Brongniart, Pecopteris hemitelioides Brongniart, 
Pecopteris candolleana Brongniart, Pecopteris arbores- 
cens Schlotheim, T'aeniopteris sp., and Walchia ( Krn- 
estia) sp. The most significant form present is Callipteris 
conferta Goeppert. This last named species is recorded 
on the basis of two fine specimens. 
The plant association in which 7vngia occurs is in 
some particulars different from the so-called Permian 
flora. In common parlance, the Lower Permian flora is 
the ‘‘Red-bed”’ flora which presumably grew in an arid 
or semi-arid region. Although both Wadlchia and Callip- 
teris are present, the abundant plants are ferns of the 
Pecopteris type. 
The correlation of this florule is made simple because 
of the presence of Callipteris which is arbitrarily accepted 
as the indicator of Permian age. However, the prepond- 
erance of Carboniferous fern species warns of difficulty 
in drawing too fine a division. The Permocarboniferous 
floras are characterized by an admixture of ferns with 
such newer (i.e.younger) genera as Walchia, Taentop- 
teris, Tingia, Gigantopteris, and finally Callipteris. 
In Asia there occurs a peculiar flora which may be 
identified by the presence of Gigantopteris. Consequently 
the region in which it occurs has been designated the 
“*Gigantopteris Province’’, and the flora has been termed 
the ‘‘Gigantopteris Flora’’. Halle” has suggested that 
these names are inappropriate because the genus occurs 
for only a short time, the latest phase, in a far more ex- 
tensive plant succession. For this more inclusive unit, he 
uses the name ‘‘Cathaysia Flora’’, after Grabau’s Cath- 
aysia land mass. 
Gigantopteris occurs also in the American South- 
west”, in Texas and Oklahoma. Here again the vertical 
extent is remarkably limited. Gigantopteris in Texas is 
younger than 7’ngia™, and it is noteworthy that Gigan- 
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