TYPE 2. GRAINS SIMPLE, CENTRIC, LENTICULAR. 205 



Chara baueri A. Braun. Dry. Size of the grain about 65/Lt. 



Cham alopccuroidca Del. Dry. Grains circular, or angular with round corners; compressed to 

 about half their width. Size about 60/li. 



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

 with numerous distinct lamellae. Size about 90/i. 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 lamellae. 

 Size about 98yu. 



Chara aspera Willd. Dry. Size about 100^. 



Chara contraria A. Braim. Dry. Size about 70(U. 



Chara gymnophylla A. Braun. Dry. Size about 68/i. 



Chara crinita Wallr. Dry. Size about 70^. 



Chara coronaia Ziz. Dry.- Size about 66yu. 



Pilularia globulifera Linn. {Marsiliacem.) 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 lamellae can rarely be distinguished. 

 Size about 24 to 50/i. The grains approach the centric-oval (type 3). 



Pilularia minuta Du Rieu. {Marsiliacece.) Dry gymnosjiorcs. Grains rounded to almost oval, the 

 Tvider 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 lamella;. Size about 17 to 

 56^. The grains very closely approach tj-pe 3. 



Ephedra distachyia Linn. {Gnetacea.) Dry seed. Grains circular, sometimes rounded-oval, kidney- 

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

 marked lengthwise slit on the narrow side; no lamellae. Size about 17/j. 



Ephedra alata Desne. {Gnetacea:.) 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 oblique fissures radiate, 

 or vAth 2 curved fissures which are joined at their convex curvatures. 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 30^1. 



SHpagigantealjEiga.sc. (Graminacece.) Dry seed. Grains circular to rounded-oval; compressed to 

 one-half and two-fifth.s of their width; no lamellae; sometimes ynih a longitudinal slit in the 

 narrow aspect. Size about 28/j. These grains 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 16). 



Heteranthelium piliferum Hochst. {Graminacece.) Dry seed. Grains circular and triangular with 

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

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

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

 grains, as in the Hordeacem. 



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

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



Triticum turgidum. {Graminacea;.) 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 lamellae; lanceolate, elliptical, or plano-convex, when seen in the 

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

 caused by erosion of the grain. 



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

 smaller. Size about 30ju. 



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

 preceding. Size 27ju. 



Agropyru?ti rigidum R. and S.; A. cristatum R. and S.; Triticum rigidum Schrad; and T. cristatum 

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

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

 the narrow aspect. Size 33m. 



