508 BOTANICAL RTTRVEY OF DISMAL SWAMP REGION. 



beneath, especially along the veins, straight or curved, pointed, with 

 rather thick cuticle, unicellular. 1 



t'cdisade (typical) in one layer. Pneumatic tissue in older leaves 

 quite open, with large lacunes. 



Hypodermal collenchyma in one to three layers above and two or 

 three beneath the larger veins, separated from the mestome bundles 

 by several layers of colorless parenchyma above and beneath, that 

 adjoining the collenchyma thickish- walled. Inner walls of the epi- 

 dermis cells also collenchymatically thickened above and beneath the 

 larger veins. 



Mestome bundles bicollateral, leptome in much smaller quantity 

 above than beneath the hadrome. 



Pluohea foetida (L.) B. S. P. 



Low Marsh formation, growing in shallow i>ools and ditches. 



Leaf bifacial, nearly horizontal, veins prominent, almost rugose 

 beneath. 



Kjiidennis: Cells large, the walls thickish, the radial very slightly 

 undulate on tin 1 ventral surface, strongly so on the dorsal surface. 



Stomata confined to the under surface, lying in all directions, some- 

 what prominent, each bordered by three or four ordinary epidermis 

 cells. Hairs abundant on both faces; glandular, short, stout, pluri- 

 cellular, uniseriate. 



Chlorenchyma nearly homogeneous, rather open, typical palisade 

 none. 



Hypodermal collenchyma in two or three layers above and below 

 the principal veins. Mestome bundles collateral, reenforced by 

 stereome above and below, this separated from the collenchyma by 

 thin-walled parenchyma. 



Bacoharis halimifolia L. 



Although the leaf anatomy <>f this species was treated in the above- 

 quoted paper on "The plant covering of Oeracoke Island," 2 certain 

 emendations are to be made to the description there given. 



The epidermis cell walls, even the outer, are only moderately thick- 

 ened, except over the larger veins. The cuticle is conspicuously 

 wrinkled. Few-celled, capitate, glandular hairs occur in groups occu- 

 pying small depressions on both ventral and dorsal surfaces, each 

 group of hairs being surrounded by a circle of wedge-shaped foot cells. 



1 Vesque (Ann. de. Sc. Nat. Bot.,ser. 7, vol. 1, p. 18">) describes glandular capi- 

 tate hairs as characteristic of Caprifoliaceae; and Solereder (Bull, de l'Herb. Bois- 

 sier, vol. 1, p. 171; Syst. Anat, p. 4!)7) believes them to be present throughout the 

 family, saving in the anomalous genus Alseuosmia. I failed to detect such hairs 

 in Lonicera sempervirem, even in young leaves which were well provided with 

 the long, pointed hairs. 



* Contr. U. S. Nat. Herb. 5, p. 307. li)00. 



