9 : 
itself. Adrien de Jussieu ' differed from his father in the interpreta- 
tion of the parts of the embryo, believing that the seutellum is not a 
true cotyledon but only a lateral appendage of the axis which resembles 
one. This view has been held by many up to the present time. Regel“ 
considered the plumule-sheath the true cotyledon, and the seutellum 
first as a stipule and again later as a bract from which the plumule 
arises laterally. In the same year Reisseck? advanced the opinion 
that the plumule-sheath is an axillary bud and that the cotyledon 
(Samenlappe) is an organ of the aborted terminal bud and the protect- 
ing leaf of the plumule, and that the epiblast is united with the 
cotyledonary-sheath, which is evidently also a part of the cotyledon. 
Lestiboudois‘ regarded the plumule-sheath as the cotyledon, but con- 
sidered the scutellum of no significance, because only the former is 
traversed by fibrovascular bundles, hence resembling two leaves grown 
together. 
Hofmeister? interpreted the embryo in different ways, describing the 
development of Zea. He called the scutellum the cotyledon and the 
" plumule-sheath a part of it. A few years later, in another work, he 
compared the so-called scutellum of the embryos of Zea ana Andropo- 
gon sorghum with the first leatless structures of Zostera. Demoor’ 
investigated a large number of the fruits of grasses in the mature 
stage, and also their development. He regarded the scutellum as the 
true cotyledon of the grasses, and the plumule-sheath not as represent- 
ing the ligule, but as a sheath of a primordial leaf. This would not, 
however, correspond to the alternating arrangement of the leaves of 
grasses, a difficulty which he bridges over by citing that there is no 
opening of the sheath in Melica uniflora because of the growing 
together of the two margins of the leaf. He admits, however, that he 
has not been able to observe this. J. C. Agardh? speaks of the embryo 
as sometimes presenting a thalloid form. Schacht“ considered the 
scutellum as the cotyledon, the plumule-sheath as the first leaf, and 
the epiblast a part of the cotyledon. 
Hofmeister,” writing again concerning the grass embryo, stated: “I 
still regard the seutellum of the grasses and the analogous structure 
Sur les embryons monocotylédones. Compt. Rend. des Soc. de l'Acad. des Sci- 
ences, 9: 15-31. 1839 
Beobachtungen über den Ursprung der Stipeln. Linnaea, 17. 
?Monocotyliseher Embryo. Bot. Zeit. 1843. 
4 Phyllotaxie anatomique, Ann. des. sc. naturelles, ser. III, 10: 15. 1848. 
5Die Entstehung des Embryo der Phanerogamen. 1849. 
5 Zur Entwickelungsgeschichte des Zostera embryo. 1852. 5 
Note sur l'embryon des Graminées. Bull. de Acad. roy. des Sci. de Brux. 1853. 
*'T'heoria system. plant. 1858. 
nen dor Seats und Physiologie der Gewachse. 2, 1859 und das Mikro- 
scope, 224. 1862. 
Neue Beitrage zur Kenntniss der Embryobildung der Phanero. 
der kónigl. sachs. Gesellschaft. d. Wien. 
1843. 
gamen Abhand. 
