8 
. 
line begins at this appearance.’ 
The Washington or Lower Dunkard is considered 
to be Pennsylvanian or Upper Carboniferous and the fos- 
sil flora of the Washington admits no other correlation.’ 
The most significant plant forms discovered in the Dunk- 
ard include 'Taeniopteris, Baiera, Callipteris and Sapor- 
tea. No specimens of these forms were known to exist 
because Fontaine’s collections were destroyed by fire. 
‘There is some reason to believe these may be rediscovered 
in old collections. In recent collections I have been able 
to find not only Taeniopteris, Baiera and Callipteris, but 
also Walchia and Lescuropteris. Of these genera, Cal- 
lipteris alone is considered to be a certain Permian in- 
dicator. 
I propose to present several short notices to estab- 
lish the status of these plants in the fossil floras of the 
Appalachian province. These ‘‘cosmopolitan’” forms (ex- 
cept Lescuropteris) are among the most important late 
Paleozoic plants known to paleobotanists. 
TAENIOPTERIS 
Taeniopteris’ is a frond-genus including diverse 
‘ 
plants. Some of the ‘‘species”’ are ferns of Marattiaceous 
affinities, although the majority are cycadophytes. In 
the absence of convincing evidence based upon. fructifi- 
‘ations, It is unwarranted to sort out the forms. It is 
usually assumed that the Paleozoic species are ferns or 
seed-ferns, and the Mesozoic species are Bennettitalean. 
The name Macrotaeniopteris has been used to designate 
the Mesozoic forms, but since a number are of diminu- 
tive size, considerable objection has been raised against 
* Darrah 1934 Proc. Geol. Soc. Am. (1933) p. 451 
*Darrah 1985 Summaries of Papers for Carb, Congress pp. 1-8 
*See Seward 1910. Foss Pls. vol. 2. pp. 485-494 
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