TYPE 2. GRAINS SIMPLE, CENTEIC, LENTICULAR. 205 



Chara baucri A. Braun. Dry. — Size of the grain about 65/i. 



Chara alopecuroidea Del. Dry. — Grains circular, or angular with round corners; compressed to 

 about half their width. Size about GO/i. 



Chara barbatn Meyen. Dry. — Grains circular; compressed to about half or more of their width; 

 with numerous distinct lamellae. Size about QO/x. In some of the grains fungi threads were 

 found which affected the starch-grains. 



Chara fragilis Desv. Dry. — Grains rounded or circular; usually with beautiful, delicate lamellte. 

 Size about 98yu. 



Chara aspera Willd. Dry. — Size about lOOju. 



Chara coniraria A. Braun. Dry. — Size about 70fx. 



Chara gymnophylla A. Braun. Dry. — Size about 68yu. 



Chara crinita Wallr. Dry. — Size about 70m. 



Chara coronata Ziz. Dry. — Size about 66ju- 



Pilularia globulifera Linn. (Marsiliacew.) Dry gymnospores. — Grains rounded, rounded-oval, rarely 

 somewhat irregular; compressed to a little more than one-half; seen in the narrow aspect, 

 a longitudinal slit or an elongated hilum, around which lamella? can rarely be distinguished. 

 Size about 24 to 50^. The gi-aius approach the centric-oval (type 3). 



Pilularia minuta Du Rieu. {Marsiliacew.) Dry gymnospores. — Grains rounded to almost oval, the 

 wider ones compressed to about one-half or more of their width; sometimes with a longitud- 

 inal slit seen in the narrow aspect; rarely with several indistinct lamellae. Size about 17 to 

 56/i. The grains very closely approach type 3. 



Ephedra distachyia Linn. (Gnetacece.) Dry seed. — Grains circular, sometimes rounded-oval, kidney- 

 shaped, or triangular with rounded angles; compressed to about two-thirds their width; a 

 marked lengthmse slit on the narrow side; no lamellte. Size about 17(U. 



Ephedra alata Desne. {Gnetacece.) Dry seed. — Grains circular to oval, often triangular with rounded 

 angles, or oval pear-shaped; about five-sixths to as broad as long; two-thirds to three-fourths 

 as thick as long; no lamella; in the wide aspect sometimes seen with indistinct radial fissures; 

 on the narrow side, with a long slit from the two ends of which single oljlique fissures radiate, 

 or with 2 curved fissures which are joined at their convex cm-vatures. Size about 27/u. 



Ephedra fragilis Desf. {Gnetacece.) Dry seed. — Grains as in the preceding, though somewhat larger, 

 and frequently with distinct radial fissures in the broad aspect. Size 30ju. 



Stipa giga7itcaJja,gSit>c. {Graminacect.) Dry seed. — Grains circular to rounded-oval; compressed to 

 one-half and two-fifths of their width; no lamellaj; sometimes with a longitudinal slit in the 

 narrow aspect. Size about 28^. These gi-ains seem to occur more frequently in the inner 

 part of the large cells of seeds. On the whole the principal bulk of starch consists of small, 

 broken separated-grains (type IG). 



Helerantheliwn pilifenmi Hochst. {Graniinaccce.) Dry seed. — Grains circular and triangular with 

 rounded angles to kidney-shaped and oval; lamellaj very delicate, if any; the circidar ones 

 compressed to a little more than or over one-half their width, with a longitudinal slit when 

 viewed from the narrow aspect. Size 20 to 25^. Among them numerous small, rounded 

 grains, as in the Hordeacece. 



Hordeacece. Seed. — The inner tissue contains numerous small grains along with large centric-lentic- 

 ular ones; the outer cells are completely filled with the small grains (type 10). 



Triticum iurgidiim. {Graniinaccce.) Fresh seed. — Grains circular, oval, or irregular; from three- 

 fourths to just as broad as long; one-third to one-half as thick as broad; sometimes with 

 distinct hilum; rarely with lamelkc; lanceolate, elliptical, or plano-convex, when seen in the 

 narrow aspect. Size about 24^. At times the outer surface has a reticulate appearance 

 caused by erosion of the grain. 



Triticum monococcum Linn. {Graniinacece.) Dry seed. — Grains as in the preceding, but somewhat 

 smaller. Size about 30yu- 



Triticum dicoccum Schrank. ; T. amyleum Sering. {Graminacem.) Dry endosperm. — Grains as in the 

 preceding. Size 27/:. 



Agropyrum rigidum R. and S.; A. cristatum R. and S.; Triticum rigidum Schrsid; and T. cristatum 

 Schreb. {Grnminacece.) Dry seed. — Grains rounded or oval; compressed to about one-half 

 to two-fifths their Avidth; without distinct lamellae; sometimes with a longitudinal slit in 

 the narrow aspect. Size 33/t. 



