212 THE POTOMAC OR YOIJNGER MESOZOIC FLORA. 



be separated by any good distinctions. The principal difference from the 

 more common and typical forms of Baieropnis is found in the greater pro- 

 portional width of the leaves and the smaller depth of the subdivision. 



Baiekopsis adiantifolia, var. mince, sp. nov. 



Plate XCIV, Fig. 1. 



Leaves nearly in shape as those of B. adiantifolia, but much smaller, 

 alternate, with their lower margins making an angle of 45°, with the stems 

 divided above the base into two lacinise, one smaller, directed upwards, 

 and divided near the summit into short strap-shaped laciuia3 that end in 

 teeth, and one larger, directed outwards, also subdivided into strap-shaped 

 lacinise ; nerves as in B. adiantifolia. 



Locality : Fredericksburg. 



This may be only the upper part of a small branch of B. adiantifolia. 



It is very rare. 



Baiekopsis macropiiylla, sp. nov. 



Plate XC, Fig. 6. 



Leaves very large, dividing repeatedly into lacinise and diverging 

 flabel lately; form and dimensions of the leaves not made out; ultimate 

 lacinise, so far as seen, 4""° wide ; nerves forking at long intervals, with the 

 branches parallel. 



Locality : Fredericksbui'g. 



Only a few specimens were found. The leaf was probably very 

 large, the fragments indicating a maximum length of about 20™, with a 

 nearly equal width. The great size of the leaves caused them to be pre- 

 served only in fragments. It is possibly a Baiera. The plant has on the 

 wider basal portions of the lacinife a number of peculiar elliptical pro- 

 tuberances, which seem to spring from off-shoots of the nerves. The exact 

 nature of these could not be made out, but they seem to be rather a 

 fungoid growth than fructification. 



BAIERA, F. Braun, emend. 



Leaves leathery, gradually narrowed into the longer or shorter pedicel, 

 fan-shaped, with repeated dichotomous subdivision, segments linear, some- 



