TYPK 14. GRAINS COMPOXIND, OF FEW COMPONENTS OF EQUAL RIZR. 207 



Trichilia sp. {Mdiacccv.) Dry. Conii)oiiud f;;raiiis coiisistiiifj; of 2 io 8, rjiroly more, equal com- 

 ponents which ju-e generally arranged regularly. Size about 18;u. Separated-gi-ains, size 

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



Guarea trichilioides Linn. {Meliacew.) Dry cotyledons. Compound grains rounded or oval, consist- 

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

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

 2 to 8fi. 



Enjthro.rylon cohunhlnum Mart. (Linaccw.) Dry cotyledons. Compound grains rounded or oval, 

 as thick as Ijroad or somewhat compressed, consisting of 2 to 12 and 20 components which 

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

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

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

 of only 2 to 8 antl 10 comi)ou(nits, and are somewhat larger. The diameter of the separated- 

 grains is about 14 and 17;u, and the cavity at the hilum is frequently one-half and one-third 

 eccentric. 



Erythro.vylon (species from Brazil) . (Linacece. ) Dry seed. In the large cotyledons the grains are com- 

 pound, consisting of 2 to 8 components; the size of the separated-grains is about 14yu. Sep- 

 arated-grains in the scarce perisperna are about 20/^. 



Erythro.rylon nitidum Mart. {Linacece.) Dry seed. -The grains are similar to those in Erythroxylon 

 columbmum. The comjjound 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. 



Erythroxylon mucronatuni Benth. {Linacece.) Dry seed. Grains as in E. columbinum. Size of the 

 separated-grains in the large cotyledons about Six, 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;u, in the plentiful perisperm 

 about IdfjL. Compound grains in the latter consist of 2 to 8 and 12 components. 



Erythroxylon 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 

 gi-ains, size about 15;u, 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 I2fx. Size of 

 the separated-grains 2 to 7n. 



Protium pubescens; Idea pubescens Benth. {Burseraceoe.) 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/u. Compound grains (the most of which have fallen apart) consist of 2 to about 10 

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

 10m, are also present; instead of the hilum a small cavity is found from which single fissiu-es 

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



Alangium dccapelalum Lan. {Cornacece.) Dry endosperm. Separated-grains with I curved surface 

 and 1 to 4 pressure facets; usually with a small central cavity; size 2.5 to 8/i. 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 %ix. 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 

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

 sures. Also simple eccentric-conical grains are present. 



Memecylon amplexicaule Roxb. {Melastomacece.) Dry cotyledons. Grains as in the preceding spe- 

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



Pyrus malus Linn.; Pyrus communis Linn. {Rosacea;.) Fresh unripe cotyledons. Grains roimded 

 and angular with rountled corners ; size about 5/i. These arc s(ii)arated-grains, since in the 

 still younger stages tnily small compound grains occur, consisting of 2 to (J and 8 almost equal 

 components. 



