TYPE 10. GRAINS SIMPLE, STRUCTURE OBSCURE. 247 



Isolepis setacea 1\. Br.; Scirpiis setaceus Linn. (Cyperaceoe.) Dry seed. Grains rounded-angular, 



many irrc^gular, and sonic also polygonal; compressed into lenticular form, occasionally with 



large reticulated markings. Siz(> about 9^. Plastids scarce and irregular. 

 Isolepis supina R. Br. ; Scirptis supiitus Linn. {Cyperacece.) Dry seed. Grains polygonal, compressed, 



with square reticulations on the surface. Size about 10/j. 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, usuallj' irregular; compressed to one-third of their width. Size about 



10;u. Plastids few and irregular. 

 Isolepis holoschcenus Roeni. and Schult.; Scirpus holoschoenus Linn. {Cyperacece.) Grains as in the 



preceding. 

 Fimbristylis dichotoma Vahl. [Cyperacece.) 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. (Cyperacece.) Dry seed. Grains rounded or rounded-angular, 



and compressed. Size about 9/i. 

 Fimbristylis brizoides Smith.; Frimbristylis laxa Vahl. (Cyperacece.) Dry seed. Grains rounded or 



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



compressed. Size 9 to 12/i. 

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



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

 Erioplwrum vaginatum Linn. (Cyperacece.) Dry seed. Grains as in the preceding species. 

 Rhynchospora fusca Roem. and Schult. (Cyperacece.) Dry seed. Grains rounded, usually angular, 



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



Plastids are irregular. 

 Cladium mariscus R. Br. (Cyperacece.) Dry seed. Grains rounded or angular. Size about 9/i. 



Some compound plastids are also observed. 

 Chcetospora nigricans Kunth.; Schcenus nigricans Linn. (Cyperacece.) Dry seed. Grains rounded. 



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

 Blysmus compressus Panz.; Schasnus compressus Pers. (Cyperacece.) Dry seed. Grains spherical; 



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



slightly compressed. Size about 9/i. 

 Scleria triglomerata Michx. ; Cladium triglomerata Nees. (Cyperacece.) Dry seed. Grains rounded, 



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



Size about 6 to lO^u. There is a great amount of oil and considerable starch in seeds, which 



are not fully ripe. 

 Scleria bracteata Cav. (Cyperacece.) Dry seed. Grains as in preceding, but somewhat less numerous; 



size not more than 7/j. 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 are well developed, and 



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

 Scleria ophryoscleria, species from Brazil. (Cyperacece.) Ripe seed. Grains similar to the preceding. 



Size about 7^l. Starch wanting in the embryo. 

 Scleria hispidula Hochst. (Cyperacece.) Dry seed. Grains rounded. Size almost 5^. Compara- 

 tively little oil and starch in unripe seeds. 

 Carex pulicaris Linn. (Cyperacece.) Dry seed. Grains rounded-angular to polyhedral; frequently 



compressed; many have a central cavity. Size about 16/ti. 

 Carex arenaria Limi. (Cyperacece.) Dry seed. Grains angular with rounded angles or polyhedral; 



the large ones compressed. Size about 7fi. 

 Carex maxima Scop. (Cyperaceas.) Dry seed. Grains rounded-angular; the large ones have a central 



cavity. Size about 6;u. Oil rather plentiful. 

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



about GfjL. Starch-grains and irregular plastids are crowded in the cells. 

 Kobresia caricina Willd.; Elyna caricina Mert. and Koch. (Cyperacece.) Dry seed. Grains 



spherical, rarely oval or shortened-conical, occasionally somewhat angular. Size about 6^. 

 Flagellaria indica Limi. (Flagellariacece.) Dry seed. Grains rounded or usuallj' polyhedral as a 



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



