1905] Cushman,— Desmid Flora of New Hampshire 117 
Intervale! Pudding Pond, North Conway! There are no plica- 
tions at the apices in these specimens nor in the series which have 
been seen from Florida and Cuba. In looking up Bailey’s original 
drawings, several of this species were found. But one of these had 
the plicated apices. This was evidently an unfortunate publication 
of this figure as the type figure, as it did not truly represent the spe- 
cies. Wolle’s figure of D. dilatum represents a typical D. undula- 
tum. 
PLEUROTAENIUM Nag. 
P. CORONATUM (Bréb.) Rab. (Docidium coronatum, Wolle '92.) 
Length 480-580 u: breadth at base 56-63 u: apices 34-40 u. Pud- 
ding Pond, North Conway! Noone’s Station! 
* Var. FLUCTUATUM West. Length goo p: breadth at base 65 u: 
at apex 46 u. Variety new to U.S. (H. C. no. 105.) Intervale! 
* P. subgeorgicum sp. nov. (PLATE 61, FIG. 4). Pleurotaenium 
of much the same type as P. Georgium Lagerh. but one third 
smaller, a crown of ten bluntly rounded spines at the apex, four or 
five undulations at the basal portion, ends of the semi-cell much 
narrower than the middle. Length 651 »; breadth at base 31 u; at 
middle of semicell 5o 4; at apex 28 y. North Woodstock! (H. 
C. no. 188.) 
P. EHRENBERGII (Bréb.) DeBary. 
* Var. ELONGATUM West. Var. new to U. S. (H. C. no. 113.) 
Length 573 m: breadth 25 a: apices 19 u. Pudding Pond, North 
Conway! This seems to be close to P. excelsum (Turner). 
* Var. UNDULATUM Schaarschm. Var. new to U.S. (H.C. no. 
101.) Length 496 u: breadth 22 p: apices 15 4. Pudding Pond, 
North Conway ! 
P. TRaABECULA (Ehrenb.) Nag. Length 496 p: breadth 25 p: 
apices 25 q. Noone's Station ! 
* Forma GRANULATA G. S. West. Length 505 mw: breadth 34 m: 
apices 28 u. Form new to U. S. (H. C. No. 76.) Mt. Moosilauke! 
Var. RECTUM (Delp.) W. & G. S. West. (Docidium rectum, Wolle, 
'92.) Length 250 p: breadth at base 19 m: apices 15 q. North 
Woodstock ! 
P. CONSTRICTUM (Bail.) Wood. (Docidium constrictum, Wolle, ’92.) 
(PLATE 61, FIG. 5.) Length 560 p: breadth at isthmus 23 u: maxi- 
