DESCRIPTION OF THE SPECIES. 211 



Locality : Near Telegraph Station. 



This plant has a decided facies of its own, due to the slenderness and 

 the length of the laciniae. The subdivisions of the leaves are much fewer 

 than in B. expansa and B. pluripartUa, and take the form of pairs. It is 

 ([uitc rare. 



Baieropsis adianti folia, sp. nov. 



Plate XCir, Figs. 8, 9; Plate XCIII, Figs, l-l! ; I'latu XC'IV, Figs.->, :i. 



Stems moderately strong; leaves subopposite to opposite, closely 

 placed, often imbricated, subquadrilateral to flabellate fan-shaped, nar- 

 rowed to a wedge-shaped base, and attached by a short pedicel which 

 springs from the lower corner of the leaf, so that the inner margin of the 

 leaves runs close to the main stem, parallel with it, and often overlapping 

 it, while the lower margin of the leaves stands nearly at right angles with 

 the main stem ; leaves cut down to near the base into two principal lacinitx;, 

 and those higher cut into two or more minor lacinise ; ultimate lacinise very 

 shallow and strap-shaped, ending in acute very short teeth, or rarely in 

 narrowly elliptical and subacute ones; all the laciniae turned outwards or 

 upwards, the lower margins of the leaves being entire or having sometimes 

 an acute tooth ; leaves in ascending towards the tips of the leafy branches 

 have their lower margins directed more and more upwards, become smaller, 

 assume more of an elliptical or a wedge shape, have the lacinias onl}^ on 

 the upper margin, and finall}' coalesce to form a terminal leaflet, which at 

 base shows three segments, but whose terminal portions are not seen ; 

 nerves fine but distinct, branching at base from a mother nerve and then 

 dividing repeatedly in a dichotomous manner so as to fill the lamina;, and 

 have the branches ending in the teeth. 



Localities : Fredericksburg ; road-side near Potomac Run ; near Tele- 

 graph Station. 



The plant is most frequent at Fredericksburg but is not abundant 

 there, and is usually in a very fragmentary state. If we look to the shape 

 of the leaves alone this curious plant is much like a fern of the type of 

 Adiantum, but the gradations through different forms connect the speci- 

 mens so closely with the flabellate leaves of Baieropsis that they can not 



