266 DIFFERENTIATION AND SPECIFICITY OF STARCHES. 



Lucuma sp. (perhaps Luauna cainilo A. DC.) (Sapolacece.) Dry cotyledons. Compound grains 

 consisting of 2 to 4, occasionally more, components which arc usually equal. Size about 20ju. 

 Separated-grains, with 1 to 3 and 4 pressure facets; size 3 to 12ix; the larger ones have a 

 small cavity with single fissures radiating toward the angles; eccentricity about one-half. 



Lucuma sp. {Sapolacece.) Dry cotyledons. Compound grains rounded to oblong, occasionally 

 somewhat irregular, 2.5 times as long as broad, consisting of 2 to 12 and more almost equal 

 components. Length about 23/^, thickness about 18/j. Separated-grains with one carved 

 surface and several pressure facets; with one large or small cavity; size 2 to lO/i. Some sim- 

 ple grains are also found. 



MyrisUca moschata Thumb. (Myristicacece.) Dry endosperm. Compound grains rounded to elon- 

 gated-oval, occasionally somewhat compressed, consisting of 2 to 10, rarely more, equal 

 components which are usually arranged regularly. Size about 27fi. Separated-grains, size 

 4 to 15m; with a small central cavity from which single short fissures occasionally proceed. 



MyrisUca salicifolia Willd. {Myristicacece.) Dry seed. Compound grains almost round to oljlong, 

 consisting of 2 to 10 and 16 usually equal components which are arranged quite regularly. 

 Size about 34^. Separated-grains frequently with a small central cavity from which short 

 fissm'es radiate; size 5 to 18/i. 



Pwonia. {Ranunculacece.) Fresh unripe endosperm of various species. Compound grains spherical 

 or oval, consisting of 2 to 4 and 6, rarely 8, components which are usually equal. Size about 

 16^. Separated-grains size 3 to 12/i. Isolated spherical or oval simple grains are also present. 

 Seeds have sprouted and are either still gi-een or have become red, and are entirely filled with 

 starch. At complete maturity they contain no trace of starch, but a great deal of oil. 



Corydalis lutea DC. {Fumariacece.) Fresh placenta of immature fruit. Separated-grains rounded- 

 angular; size about 5/.(. Compound grains consisting of 2 to 8 components are also found. 

 Starch quite plentiful. 



Brassica napus Linn. {Brassicacece or Cruciferce.) Fresh endosperm, cotyledons, and seed-coats of 

 immature unripe seeds. Separated-grains with 1 curved surface and 1 to 4 pressure facets; 

 size 8 to 12;u. The few compound grains which have not fallen apart consist of 2 to 4 almost 

 equal components. Simple grains of incomplete formation are also observed. 



Carolinea princeps Linn. {Malvacece.) Dry cotyledons. Compound grains consisting of 2 to 6 com- 

 ponents which sometimes are equal and regularly or often unequal and irregularly arranged; 

 1 large and 1 to 4 small components. Separated-grains with 1 curved surface and 1 to 4 

 pressure facets; with a small central cavity and single radial fissures. Size about 15 to 20;u; 

 also simple eccentric-conical grains are also observed. 



Heritiera littoralis Ait. {Sterculiacece.) Dry cotyledons. Compoimd grains spherical elongated- 

 lanceolate, frequently somewhat irregular, 3 times as long as broad, consisting of 2 to 12 or 

 more components which are almost equal and usually arranged regularly (rarely in a simple 

 row). Size about 23/i. Separated-grains with a central cavity from which short fissiu-es 

 radiate. Size 4 to lOju. Some simple spherical grains are also observed. 



Thcohroina cacao Linn. {Sterculiacece.) Dry cotyledons. Separated-grains rounded-angular, fre- 

 quently with 1 curved surface and 1 to 3 pressm-e facets. Size about 8fi. Compound grains 

 consisting of 2 to 4, rarely more, almost equal components. The cells are filleil with oil in 

 which the starch-grains are scattered. 



Thea bohea Linn. {Camelliacece.) Dry cotyledons. Compound grains consisting of 2 to 4, rarely 8 

 components, which are usually equal and regularly arranged (of which 3 are usually arranged 

 lineally, 3 and 4 in one plane). Size about 20 to 25/i. Separated-grains, size 4 to 9 and 12ju; 

 instead of a hilum a small cavity is observed from which fissures usually radiate toward the 

 sui'face of the pressure facets. Simple grains of incomplete formation are also found. 



Triphasia aurantiola Lorn'.; Limonia trifoliata Linn. {Rutacece.) Dry cotyledons. Grains consist- 

 ing of 2 to 4 and 8 comjionents of different sizes. Separated-grains usually with 1 to 3 pros- 

 sure facets and a small cavity; size 3 to 8/i. A few simple rounded and rounded-oval grains, 

 size about 9^, are also present. The seeds are quite conspicuous and seem to be mature. 

 TIk; cells are filled with starch, and have little or no oil. 



Trichilia mia-antha Benth. {Mdiacece.) Dry cotyledons. Compound grains rounded to oblong, 

 frequently irreg\ilar, consisting of 2 to 8 and 12 components which are usually equal. Size 

 about 15 to 20|i. Sepai'ated-grains, size 3 to 11/^; the larger ones have a small central cavity. 



