ANATOMY OF TRIGLOCHIN AND JUNCUS. 301 



SALT MARSH SPECIES. 

 TRIGLOCHIN STRIATA Ruiz & PaV. 



Leaf isolate™!, thickish. 



Epidermis cells with nonundulate walls, the outer strongly thick- 

 ened; cuticle thick, granular; stomafa in rows parallel to the nerves, 

 level with the surface, each bordered by ! epidermal cells, of which 2 

 are subsidiary and resemble the guard cells; hairs none. 



Stereome none. 



Chlorenchyma: Two outer layers compact, continuous on both sur- 

 faces, not palisadie except at the leaf margins, where .'J layers of pali- 

 sade occur; parenchyma of the interior of the leaf containing little 

 chlorophyll, interrupted by lacunes. 



Mestome bundles imbedded in the interior parenchyma, each sur- 

 rounded by a small-celled mestome sheath, whose inner walls are 

 excessively thickened and layered; this surrounded by a sheath of 

 large-celled, colorless parenchyma. 



Spartina STRICTA (Ait.) Roth. 



Treated for comparison among sand-strand grasses, page 289. 



Juncus roemerianus Scheele. 



Leaf vertical, terete, sharp-pointed, stem-like. 



Epidermis cells all small, quadrangular (superficially), regular, 

 without alternation of long and short cells; smaller and thicker- walled 

 over the bands of chlorenchyma than over those of subepidermal 

 stereome, the outer walls much thickened and porous; stomata 1 with 

 guard cells level with the other epidermal cells; hairs none. 



Stereome (subepidermal) alternating with the chlorenchyma in 

 strong groups, which in cross section are I-shaped. 2 



Chlorenchyma of typical long, narrow palisade cells, mostly in 5 or 

 6 layers. 



Mestome bundles arranged in several concentric circles, com- 

 pletely surrounded by stereome (which is particularly strong on the 

 two sides parallel to the leaf surface), the whole enveloped by a 

 beautifully regular, large-celled parenchyma sheath. Within the 

 stereome the bundle is encircled by a mestome sheath of small, thick- 

 walled cells. The outer mestome bundles, with the colorless paren- 

 chyma between, form a continuous ring, unbroken by lacunes. The 

 inner bundles lie in thin longitudinal plates of parenchyma, which 

 separate large lacunes. Small bundles of stereome, each surrounded 

 by a parenchyma sheath, also occur in the interior of the leaf. 



Stem differing but little from the leaf; difference consisting chiefly 

 in the presence of a cortex of some thickness, and in the less elon- 

 gated chlorenchyma cells. 



'Of the type common in Jnncaeeae. Cyperaceae, and Gramineae. 

 s " I-formige Trager "' of Schwendener, 



