TYPE in. GRAINS COMPOUND, MANY COMPONENTS. 279 



Pappophorum macrostachywn Nees. {Gramiiiacece.) Dry endosperm. Separated-grains size 3 to 8 

 and 10m; polylicdral or with 1 curved KiirfaiH? and 1 to 5 pressure facets; usually with a large 

 or a small cavity. Niigeli observed only a few compound grains, ami also spherical or oval 

 simple grains. 



Poppophorum nigricans R. Br. (Graminacem.) Dry endosperm. Compound grains spherical or 

 oval, consisting of 2 to 10 or more equal comjjonents; size about 30 and 30^. Separated- 

 grains size 5 to 20 antl 2,')/^; usually with one ciirvetl surface and 1 to 5 pressure facets; rarely 

 entirely polyhedral (only outlined by j)ressure facets) ; with a central cavity antl radial fissm-es. 

 Simple centric-spherical gi'ains are also present. The compound grains of Pappophorum 

 nigricans properly belong to type 14. They are placed here because of their relationshij) to 

 the other two species. 



Ptiloneilema plumosum Steud. ; Etdriana abyssinica R. Br. {Graminacece.) Dry endosperm. Sep- 

 arated-gi'ains polyhedral, frequently with a small cavity and also single delicate radial fis- 

 sures; size 3 to 12/Li. The majority of the compound grains have fallen apart, the few remain- 

 ing ones are polyhedral as the result of pressure. 



Echinaria capitata Desf. (Graminacew.) Dry endosperm. Compound grains (few intact ones still 

 present), spherical or oval, frequently somewhat angular; size about 34/i. Separated-grains 

 polyhedral with sharp borders and angles; size 4 to 18ju. 



Ctenium elegans Kunth. {Graminacem.) Dry endosperm. Separated-grains solid or with a central 

 ang-ular cavity, frequently with 1 curved surface and 1 to 5 pressure facets, many of them 

 entirely polyhedral. The majority of the compound grains have fallen apart, those remain- 

 ing are rounded or oval, consisting of 2 to about 20 components; size about 12/i. Simple 

 grains few, spherical, or rounded-oval, solid or with a small central cavity; size about 10/i. 



Ctenium chapadense Trin. (Graminacew.) Dry endosperm. Separated-grains, size about 11/i; 

 frequently jiolyhedral (only outlined l)y pressure facets); many of them have one curved 

 surface and 3 to 5 pressure facets; the larger ones have an angular cavity from which short 

 radial fissures proceed. Very few compound grains are present. 



Microchloa setacea R. Br. {Graminacew.) Dry endosperm. Separated-grains polyhedral, the majority 

 with a large or a small cavity; size 3 to lOyu. Only a few free compound grains are present; 

 oval or almost polyhech-al; size about 20 to 2.5/i. 



Chloris petrwa Thumb.; Eustachys petrwa Desv. (Graminacece.) Dry endosperm. Separated-grains 

 polyhedral, the larger ones with a central cavity; size 2 to 9^- All the compound grains have 

 fallen apart. 



Chloris submutica Humb. Bonp.; Eustachys submutica R. and S. (Graminacece.) Dry endosperm. 

 Compound grains spherical or oval, reticulated; size about 24/i. Separated-grains rounded- 

 angular to polyhedral; rarely with a small cavity in the larger ones; size 2 to 8yu. 



Ctenopsis pectinella Taris.; Festuca Nop. Del. {Graminacece.) Dry endosperm. Separated-grains 

 rounded or rounded-angular; size 0.8 to 3//, a few compound grains are still found, granular; 

 size about 14yu. 



Eleiisi7ie caracana Gai-t. {Graminacew.) Dry endosperm. Separated-grains polyhedral, only outlined 

 by pressure facets or with one curved surface and several pressure facets, with sharj) nuirgins 

 and angles; the larger ones have a small central cavity from which several fissures frequently 

 radiate toward the angles; size 4 to 13^. The greater number of the compound grains have 

 fallen apart; the remaining ones are spherical or oval, about 30/i in length, and consist of 2 to 

 50 and 100 equal components, which when few in number (4 to 10) show a regular arrangement. 



Dactyloclenium wgyptiacum Willd. {Graminacew.) Dry endosperm. Compound grains spherical or 

 oval (not at all angular), granular or reticulated-granular; size about 15 to 21/i. Separated- 

 grains rounded-angular to polyhedi'al; the larger ones with a small cavity; size 1.5 to 5.5/i. 



Cynodon daclylon Pers.; C. linearis Willd. {Graminacew.) Dry endosperm. Se]5arated-grains poly- 

 hedral, usually with a small or large angiilar cavity; size 2.5 to 8/^. A few free compound 

 grains are observed, oval or nearly polyhedral; size about 20^. 



Chondrosium sj). {Graminacew.) Dry endosperm. Sei)arated-gTaius rounded-angular to poly- 

 hedral; size 2 to l'^^l. Onlj' a few compound grains are ob.served. 



Sparlina cynusuroides Willd. {Graminacew.) Dry endosperm. Separated-grains j)olyhedraI, several 

 with a small cavity. Only a few intact compound grains still present, consisting of 2 to 12 

 components. 



