1899] SOCIETY FOR PLANT MORPHOLOGY L245 
as in certain Composite. The suspensor is divided into two 
regions, micropylar and embryonal. The latter is composed of 
disk-shaped cells; the former of large cells swollen out laterally, 
forming absorbing organs which become applied to the endosperm. 
A free preparation of these structures resembles a bunch of 
grapes, a condition similar to that described for Sutherlandia by 
Hofmeister and Guignard. The integument becomes absorbed, 
the seed-covering consisting of the pericarp and a single layer of 
cells derived from the integument. 
Inflorescences and flowers of Polygala polygama:; CHARLES H 
SHAW, University of Pennsylvania.—In addition to the well- 
known pink-purple aerial and subterranean cleistogamic flowers, 
an exactly intermediate type is developed on special inflores- 
cences. These are green aerial cleistogamic flowers, borne on 
shoots which, though produced considerably above ground, are 
slightly or strongly geotropic. A detailed account of the differ- 
ences between the three types was given, 
Observations on the development of some monocotyledonous embryo 
aoe Pe, McKenney, University of Pennsylvania.— The 
development of the embryo-sac in two species of Scilla, S. hya- 
cinthoides cerulea and S. campanulata was described in detail, while 
reference was made to Lilium. No centrosomes were observed 
during the resting condition of the nuclei or during mitosis. 
The structure and r elation of the crystal cells in sensitive plants: 
ae Ke McKenney, University of Pennsylvania The crystal 
BRE eerily plants form a complete sheath around the 
side of Ua of stems and a half-sheath around the phloem 
large 1B bundles. Each cell of the sheath contains a single 
ble silj agonal crystal. The crystals seem to be rather insolu- 
cates. The crystal cells have a very small enucleolate 
sbpeaiens. nora, and no starch. The crystals make their 
the first f cok in the cells at the distal end of the bundles of 
S€Nsitive vies leaf and are formed basipetally. The more 
develo : ants have the crystals either more abundant or better 
ped than the less sensitive plants, and vice versa. 
