OLDER POTOMAC OF VIRGINIA AND MARYLAND. 489 



The following species were found at these localities: 



Araucarites aquiensis Font 1 specimen. 



Baieropsis f oliosa Font 1 specimen. 



Carpolithus brookensis Font 2 specimens. 



Celastrophyllum albfedomus Ward n. sp 1 specimen. 



Ficophyllum eucalj^ptoides Font_ . ^ .3 specimens. 



Glyptostrobus (Taxodium) brookensis (Font.) Ward. 13 specimens. 



Glyptostrobus brookensis angustifolius (Font.) Kn_ _ 5 specimens. 



Glyptostrobus ramosus Font. n. comb. [Taxodium (Glyptostrobus) 



ramosum Font.] 1 specimen. 



Sapindopsis magnif olia Font 3 specimens. 



Sapindopsis tenuinervis Font 1 specimen. 



Sapindopsis variabilis Font 28 specimens. 



Sequoia cycadopsis Font 1 specimen. 



Sphenolepidium Kurrianum (Dunk.) Heer 1 specimen. 



Splienolepidium Sternbergianum densifolium Font 3 specimens. 



Celastrophyllum alb.edomus Ward n. sp." 



PI. CVIII, Fig. 3. 



Glyptostrobus brookensis angustifolius (Fontaine) Knowlton. 



PI. CVIII, Fig. 4. 



1SS9. Taxodium (Glyptostrohus) hrookense angustifolium Font.: Potomac Flora 



(Monogr. U. S. Geol. Surv., Vol. XV), p. 256, pi. clxvii, figs. 1, la. 

 1898. Glyptostrohus hroolcense angustifolium (Font.) Kn.: Bull. U. S. Geol. Surv., 

 No. 152, p. 112. 

 Five specimens of this plant were collected by Professor Ward and 

 Mr. Mason in the light-colored clays that immediately overlie the orig- 

 inal Mount Vernon plant bed and that belong to the Brooke horizon. 

 The best of these is shown in PL CVIII, Fig. 4. 



"In my study of these collections mentioned above (p. 493) I provisionally identified this leaf with 

 Celastrophyllum Brittonianum Hollick (Newberry, Flora of the Amboy Clays: Monogr. U. S. Geol. Surv., Vol. 

 XXVI, p. 105, pi. xlii, figs. 37, 38, 46, 47), but did not describe it. Professor Fontaine returned it with the 

 request that I treat it, as he was not- acquainted with that species. A closer examination shows that it is 

 not that species, but a new one. It may be described as follows: 



Leaf ovate-lanceolate, rounded at the base and apex, unequal-sided, crenate-toothed, 4 em. long exclusive 

 of the petiole, which is wanting, 16 mm. wide at the middle; midrib strong and straight, secondary nerves 

 camptodrome, delicate, curving forward, forking and anastomosing midway between the midrib and the mar- 

 gin, the branches forming festoons along the margins. 



This pretty little leaf, perfect except the petiole, was collected on May 14, 1893 (see p. 494), at the 

 locality previously discovered by Mr. William Hunter in the White House Bluff. The name alludes to 

 the locality. The foundations of the former "White House" may still be seen on the bank of the Potomac 

 at the foot of the bluff not (ar from the plant locality. This house was once a favorite resting place for fisher- 

 men and river men, and later a resort for excursionists from Alexandria and Washington, and the pavilion 

 erected for dancing had not yet fallen in at the time of my first visit to the place. — L. F. W 



