TYPE 14. GRAINS COMPOTTND, OF PEW COMPONENTS OF EQUAL SIZE. 207 



Trkhilia sp. {Mdiacece.) Dry.— Coiiipouiul grains CDiisisting of 2 to 8, ran-ly more, (-(nial com- 

 l)oneiits which are generally arranged regularly. Size about 18m. Separated-gi-ains, size 

 4 to 12ju; a small cavity and single indistinct, short radial fissures are observed. 



Guarea trichilioides Linn. (Meliaccce.) Dry cotyledons. — Compound grains rounded or oval, consist- 

 ing of 2 to 12 and 20 mostly equal components. Size about 15^. Sejiarated-grains usually 

 with 1 ciu-ved surface and 1 to 5 pressure facets; the larger ones witli a small cavity. Size 



2 to SyU. 



Erythruxylon coluniblnum Mart. (Linacece.) Dry cuiyledons. — Compound grains rounded or oval, 

 as thick as broad or somewhat comjiressed, consisting of 2 to 12 and 20 components which 

 are usually almost equal. Size about 20 to 25yu. Separated-grains, size 3 to llyii; with a small 

 central cavity and single radiating fissures. The starch-grains in the scarce perisperm of the 

 same jilant are like those in the cotyledons, although the average compound ones consist 

 of only 2 to 8 and 10 components, and are somewhat larger. The diameter of the separated- 

 gi-ains is about 14 antl 17^, and the cavity at the hilum is frequently one-half and one-third 

 eccentric. 



Erythrorylon (species from Brazil) . {Linacece. ) Dry seed. — In the large cotyledons the grains are com- 

 l)ound, consisting of 2 to 8 components; the size of the separated-grains is about 14^. Sep- 

 arated-grains in the scarce perisperm are about 20/i. 



Erythroxylon ni.tidum Mart. {Linacece.) Dry seed. — -The grains are similar to those in Erythroxylon 

 columhinum. The compound grains in the large cotyledons consist of 2 to 10 and 16 com- 

 ponents. Size 15/i. Size of the separated-grains about 6 to 7^. Perisperm almost entirely 

 wanting. 



Erylhrox ijlon mucronatum Benth. {Linacece.) Dry seed. — Grains as in E. colmnbinuni. Size of the 

 separated-grains in the large cotyledons about 8^, and in the very scant perisperm about 9^. 



Erythroxylon rufum Cav. {Linacece.) Dry seed. — Grains as in Erythroxylon columbinum. The 

 size of the separated-gi-ains in the small cotyledons is about 10^, in the plentiful perisperm 

 about 15/u. Compound grains in the latter consist of 2 to 8 and 12 components. 



Erythro.vylon obtusum DC. {Linacece.) Dry seed. — Grains as in Erythroxylon columbinum. Size 

 of the separated-grains in the abundant perisperm is about 15^. Some simple spherical 

 grains, size about 15ju, are also found. 



Cupania tomentosa Swartz. {Sapindacece.) Dry cotyledons. — Compound grains consisting of 2 to 8 

 and 12 usually equal components which are arranged regularly. Size about 12^. Size of 

 the separated-grains 2 to 7yu. 



Protium pubescens; Idea pubescens Benth. {Burscracece.) Dry cotyledons. — Separated-grains angular 

 with rounded angles, or oval with 1 curved surface and 1 to 5 pressure facets; instead of a 

 hilum a small cavity is observed, and in the larger ones also single radial fissures. Size 2 to 

 9//. Compound grains (the most of which have fallen apart) consist cf 2 to about 10 

 usually equal components. Simple grains, rounded, oval, and low cone-shaped, size about 

 lOju, arc also present; instead of the hilum a small cavity is found from which single fissm-es 

 radiate, about one-half eccentric. These grains probably belong to the eccentric-conical type. 



Alangium dccapetalum Lan. {Cornacece.) Dry endosperm. — Separated-grains with 1 curved siu-face 

 and 1 to 4 pressure facets; usually with a small central cavity; size 2.5 to 8^. Compound 

 grains are no longer present; probably they consisted of 2 to 8 equal components. 



Alangium hexapetalum Lam. {Cornacece.) Dry endosperm. — Grains polyhedral, with a small central 

 cavity; size 3 to 9(1. They lie closely packed in the cells, which they completely fill. They are 

 probably separated-grains. Nageli could not clearly distinguish any compound ones. 



Memecylon capense Eckl. Zeyh. {MelastomacecE.) Dry cotyledons. — Compound grains consisting of 

 2 to 4 and more mostly equal, rarely unequal, components. Separated-grains, size 4 to 

 14m, are usually oblique and unsymmetrical; they have a small cavity and single radial fis- 

 sures. Also simple eccentric-conical grains are present. 



Memecylon amplexicaule Roxb. {Melaslomacece.) Dry cotyledons. — Grains as in the pre(!eding spe- 

 cieS; but the separated-grains are more symmetrical. Simple grains are also present. 



Pyrus malus Linn.; Pyrus communis Linn. {Rosacece.) Fresh unripe cotyledons.^GTuhw rounded 

 and angTilar with rt)unded corners; size about Syu. These are seijarated-grains, since in the 

 still younger stages only small comjjound grains occur, consisting of 2 to and 8 almost equal 

 components. 



