2 : thallium is in the four-celled stage, and at its tip two ¢ 
<< izing cells are found, which are probably the undevelo 
. a tum, vont ‘is not the case where a ‘‘spongy”’ tissue 
ae es sho | 
8 ote first becomes firm, and in - alcohol-fixed | 
96 BOTANICAL GAZETTE 
which is not at all points sharply distinct from the protoplasm 
the pollen tube (jig. 76). There is no starch. Goroschankit 
(1880)3 found starch in the male cells of the Cupresseae, 
Arnoldi (1900) found it in Sequoia sempervirens, Cryptoment 
and Taxodium. This I can confirm for Taxodium. 
ASalready stated, the pollen tube was found to contain t 
nuclei in addition to the male cells. 
THE FEMALE PROTHALLIUM. | 
The macrospore arises deep in the nucellus and is not 
rounded by “spongy”’tissue such as is found in the Abie 
Cupresseae, and Taxodieae, and which has so often been eftr 
neously described as of sporogenous character. Miss Ferg 
(1901, 6) suggestion that the spongy tissue is active in 
ing the prothallium i is probably correct; an interpreta 
Ayes at from a study of Taxodium. : 
The youngest stage found is illustrated in fig. 7 82 : Th 
_ Spores, but at this late stage it is not safe to draw: 
__ Sion as to their origin. The prothallium is surrounded 
; Se of the. ordinary vegetative type, the innermost of whic n 
‘ga izing. The disorganizing cells abut directly on | 
: “rows a cells conspicuous i in young prothallia show that 
fae arises in the usual way by ingrowing tubes. 
