TYPE 10. GRAINS SIMPLE, STRUCTURE OBSCURE. 247 



Isolepis setacea R. Br.; Scirpus setaceus Linn. (Cyperaceoe.) Dry seed. — Grains rounded-angular, 



many irregular, and some also polyg<jnal; comjiressed into lenticular form, occasionally with 



large reticulated markings. Size about 9/i. Plastids scarce and irregular. 

 Isolepis supina R. Br. ; Scirpus supinus Linn. (Cyperacece.) Dry seed. — Grains polygonal, compressed, 



with square reticulations on the surface. Size about lO/i. Starch-grains are crowded in the 



cells. Plastids none or very few. 

 Isolepis eckloniana Schrad. ; Isolepis verruculosa Steud. {Cyperacece.) Dry seed. — Grains rounded- 

 angular or polygonal, usually irregular; compressed to one-third of their width. Size aljout 



10/x. Plastids few and irregular. 

 Isolepis holuschoenus Roem. and Schult.; Scirpus holoschoenus Liim. {Cyperacece.) — Grains as in the 



preceding. 

 Fimbristylis dichotoma Vahl. {CyperacecB.) Dry seed. — Grains rounded, oval, usually angular, often 



strongly compressed. Size about 10^. Plastids of irregular form are also present. 

 Fimbristylis annua Roem. and Schult. {Cyperaceoe.) Dry seed. — Grains rounded or rounded-angular, 



and compressed. Size about 9^. 

 Fimbristylis brizoides Smith.; Frimbristylis laxa Vahl. {Cyperaceoe.) Dry seed. — Grains rounded or 



rouuded-oval, frequently somewhat angular, rarely almost polyhedral; slightly or not at all 



compressed. Size 9 to 12/^. 

 Eriophorum alpinum Linn. {Cyperacece.) Dry seed. — Grains rounded, oval, frequently angular. 



Size about 6/i. Oil plentiful ; plastids numerous. 

 Eriophorum vaginatum Linn. {Cyperaceoe.) Dry seed. — Grains as in the preceding species. 

 Rhynchuspora fusca Roem. and Schult. {Cyperacece.) Dry seed. — Grains roimded, usually angular, 



and often strongly compressed. Size about 15/i. Some doublets and triplets are also observed. 



Plastids are irregular. 

 Cladiiun niariscus R. Br. {Cyperacece.) Dry seed. — Grains rounded or angular. Size about 9ju. 



Some compound plastids are also observed. 

 Chcetospora nigricans Kunth.; ScJmnus nigricans Linn. {Cyperacece.) Dry seed. — Grains rounded. 



Size about 5ju. Some oil and plastids are also observed. 

 Blysmus compressus Panz.; Schanus com^wessus Pers. {Cyperacece.) Dry seed. — Grains spherical; 



rounded-triangular, oval, shortened-conical ; occasionally somewhat angular, frequently 



slightly compressed. Size about 9yu. 

 Scleria triglomerata Mich.x.; Cladiuni triglomerala Nees. {Cyperacece.) Dry seed. — Grains roumled, 



rarely elongated-oval, frequently somewhat angular, the broad ones occasionally comjiros-seil. 



Size about 6 to lO/x. Thei'e is a great amount of oil and considerable starch in seeds, which 



are not fully ripe. 

 Scleria bracteaia Cav. {Cyperacece.) Dry seed. — Grains as in preceding, but somewhat less numerous; 



size not more than 7m. Seeds not fully developed. 

 Scleria microcarpa Nees. {Cyperacece.) Dry seed. — Grains rounded, rarely oval, usually more or 



less angular, the broad ones slightly compressed. Size 8^. Seeds ai-e well developed, and 



contain much oil and starch, as well as numerous almost polyhedral plastids. 

 Scleria ophryosclcria, species fiom Brazil. {Cyperacece.) Ripe seed. — Grains similar to the j^receding. 



Size about 7/Li. Starch wanting in the embryo. 

 Scleria hispidula Hochst. {Cyperacece.) Dry seed. — Grains rounded. Size almost 5//. Comjiara- 



tively little oil and starch in unripe seeds. 

 Carex pulicaris Linn. {Cyperaceoe.) Dry seed. — Grains rounded-angular to polyhedral; frequently 



compressed; many have a central cavity. Size about 16^. 

 Carex arenaria Linn. {Cyperacece.) Dry seed. — Grains angular with rounded angles or polyhedi-al; 



the large ones compressed. Size about 7^. 

 Carex maxima Scop. {Cyperaceoe.) Dry seed. — Grains rounded-angular; the large ones have a central 



cavity. Size about 6ai. Oil rather plentiful. 

 Elyna spicata Schrad. {Cyperacece.) Dry seed. — Grains spherical or oval, frequently angular. Size 



about Gyu. Starch-grains and irregular plastids are crowded in the colls. 

 Kobresia curicina Willd.; Ebjna caricina Mert. and Koch. {Cyperacece.) Dry seed. — Grains 



spherical, rarely oval or shortened-conical, occasionally somewhat angnilar. Size about G^- 

 Flcigellaria indica Linn. {Flagellariaceai.) Dry seed. — Grains rounded or usually polyhedral as a 



result of pressure. Size about 5//. Starch-grains fill the cells. 



