264 DIFFERENTIATION AND SPECIFICITY OP STARCHES. 



pressure facets; tho larger ones have a small cavity and frequently several radial fissiu-es. Sim- 

 ple spherical and spherical-oval grains are also observed; size 13^. These apparently belong 

 to the centric-spherical type. Some of the polyhedral grains may also be simple forms. 



Kottbaella arundinacece Hochst. (Graminaceoe.) Dry endosperm. Separated-grains with one curved 

 surface and 1 to 4 pressure facets; instead of the hilum a small cavity is usually observed 

 from which single fissures sometimes radiate. Size 3 to 8n. Compound grains are less freely 

 observed; they probably consist of not more than 8 to 10 components. Simple centric- 

 spherical grains are also present. 



Rolthcella campestris Nutt. {Graminacece.) Dry endosperm. Compound grains spherical or oval, 

 consisting of 2 to 20 equal parts (few seen free). Separated-grains, size 2 to 10^; some with 

 one curved surface and 1 to G pressure facets; others completely polyhedral; the larger ones 

 usually with a small cavity and often with single radiating fissures. Also simple grains, 

 spherical or spherically-oval; size about 12ju; the larger ones with a small central cavity and 

 several radial fissiires, belonging to the centric-spherical type (type 1). Many of the poly- 

 hedral gi'ains may also be simple. 



Lucwa colorata Hochst. {Graminacece.) Dry endosperm. Sejjarated-grains with 1 curved siu-face 

 and 1 to 5 pressure facets, hollow. Size 3 to WjJ-. Compound grains of not many components 

 are very scarce; also simple hollow grains almost round, rarely oval, and somewhat com- 

 pressed. Size about 13;u. The simple and the separated-grains (the former about one-half 

 to one-third as munerous as the latter) look exactly alike; the central cavity in both is large, 

 uneven, angular, jagged, or extends into short radial fissures. 



Wachendorfia Mrsuta Thumb. {Hcemodoracece.) Dry enrfosperm. Compound grains (most of 

 which have fallen apart) consist of 2 to 12 and more components, which are almost equal, 

 and regularly or irregularly arranged. Separated-grains, size 3 to 20ju; rounded-angular or 

 polyhedral, with large or small cavity which is frequently very conspicuous. The starch 

 gives the impression of having been affected by heat. 



Hoeniodorum (a species from Swan River). {Hcemodoracece.) Dry endosperm. Compound grains 

 almost round to oblong and pear-shaped, frequently somewhat irregular, consisting of 2 to 

 10 almost equal components (frequently arranged 4 in a square, and sometimes in a row), 

 rarely falling apart; lines of division sometimes indistinct or entirely wanting, so that the 

 cavities of the components are seen, as in type 12. Size about 28^. Single components, 

 size about 13ju; almost oval and have rather large, often slit-like cavity. Simple grains, 

 size about 16ju; oval, and slightly compressed with a slit-like cavity. It is rather uncertain 

 whether these belong to the eccentric or to the oval type. A constant analogy which the 

 compound grains of few components holds with those of the seeds of Leguminosce is in support 

 for the latter type. 



Barhacenia rogieri Hort. {Amaryllidacece.) Dry endosperm. Separated-grains more or less poly- 

 hedral, frequently with sharp angles and edges; isodiametric or twice as long as broad; with 

 a central almost round or elongated cavity from which radial fissures diverge. Size 3 to 

 18/u, width about 14/i. Few compound grains are less seldom present; they consist of 2 to 8 

 components. 



Hohenbergia strobilacea Schult. fil. {Bromeliacece.) Dry endosperm. Compound grains spherical or 

 oval, sometimes somewhat irregular as a result of pressure, consisting of 2 to 5 almost equal 

 components which are arranged either irregularly or regularly (3 in a triangle or 4 in a square 

 or tetrahedron). Size about 15//. Separated-grains almost isodiametric; they frequently have 

 a small central cavity, without fissures. Also simple centric-spherical grains are also found. 



BiUbergia zebrina Lindl. {Bromeliacece.) Dry endosperm. Compound grains spherical-oval, rarely 

 irregular; consisting of 2 to 6ju, rarely more, almost equal components which are regularly 

 arranged. Size about 21yu. Separated-grains with rather sharp angles and margins; with 

 a small central cavity from which single fissures occasionally proceed. Size 4 to lO/i. Simple 

 centric-spherical grains are also present. 



Pitcairnia alhuccejolia Schrad.; Pitcairnia punicea Lindl. {Bromeliacece.) Dry endosperm. Sejiar- 

 ated-grains with 1 to 4 ]5ressure facets with rather sharp angles and margins; usually with a 

 large cavity from which single ratlial fissures occasionally proceed. Size 4 to 12 and \&n. 

 Compound grains few, consisting of 2 to 6 components. Simple centric-spherical grains are 

 also present. 



