ANATOMY OF TRIGLOCHIN AND JUNCUS. 301 



SALT MARSH SPECIES. 

 TRIGLOCHIN STRIATA Ruiz tfc PaV. 



iea/ isolaterul, thickish. 



Epidermis cells with noimndulMte walls, the? outer strongly lliick- 

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

 level with the surface, each bordered by 4 epidermal cells, of which 2 

 are subsidiary and resemble the guard cells; hairs ncjiie. 



Stereome none. 



Chlorenchyma: Two outer layers compact, continftous on l)oth sur- 

 faces, not imlisadic excei)t at the leaf margins, where o layers of i)ali- 

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

 chlorophyll, interrnpted by lacunes. 



Mestome hundles imbedded in the interioi- x^arenchyma, 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 parenchj^ma. 



Spartina stricta (Ait.) Roth. 



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



JuNCUS ROEMERIANUS Scheele. 



J/er// 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^ with 

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



Stereome (subepidermal) alternating with the chlorenchyma in 

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



Cldorencliyma of typical long, narrow palisade cells, mostl}" in 5 or 

 6 layers. 



Mestome hundles arranged in several concentric circles, com- 

 pletely surrounded hy stereome (which is particularly strong on thc^ 

 two sides parallel to the leaf surface), the whole enveloi^ed by a 

 beautifully i-egular, 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 pareii- 

 ch3"ma between, form a continuous ring, unbroken by lacunes. The 

 inner bundles lie in tliin longitudinal plates of parenchyma, wliich 

 separate large lacunes. Small bundles of stereome, each surrounded 

 by a i)arencli3nna sheath, also occur in tlie interior of the leaf. 



Stem differing but little from the leaf; difference consisting cliiefly 

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

 gated chlorenchyma cells. 



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



2 '* I-formige Trager "' of fecliweudener. 



