251 
running from the base towards the micropyle, which 
suddenly die out when they reach the flat apical region 
of the seed. Surrounding the micropyle ridges, corresponding 
with the ribs, indicate the place of the probable fusion of 
the integumental units (fig. 2). 
Ginkgoales. 
$ 19. Ginkgo biloba L. 
Literature: Affourtit and La Rivière (1), Caruthers 
Bla Celakovsky (45), Cook"(60), Fuite (66), 
Heer (70), Jeffrey and Torrey (74), Salisbury 
(127), Seward and Gowan (136), Spiess (141), 
Sprecher (142), Tupper (161), Wettstein (168). 
Marerial: Huize ten Donck, Slikkerveer (Holland). 
Botanical Garden, Rome. 
The female fructifications of Ginkgo are borne on short 
shoots or brachyblasts. In the axils of the ordinary leaves 
and in those of the bracts, thin stalklets arise with gene- 
rally two or three ovules at their top. The morphological 
value of this organ has been uncertain for a long time. 
At first Eichler (61) speaks of inflorescences having 
ein transversales und häufig noch ein zweites medianes 
Blüthenpaar oder nur eine Blüthe desselben” (p. 65) after- 
wards, however, he changes his opinion (64) and calls 
them ,einfach behüllten Samen auf rudimentären kurz 
manchettenfôrmigen Fruchtblättern"” (p. 109). Other authors 
amongst whom Engler, CelakovskŸ (45), von Wett- 
stein (168) Velenovsk\ (165), Fujii (66), Seward 
and Gowan (136) have adopted this last view, and 
acknowledge that we have to do with a strobilus bearing 
two or more macrosporophylls, generally being reduced 
to the collarlike arillus at the base of the ovule. There 
Recueil des trav. bot. néerl. Vol. XVII. 1920. 17 
