2 BOTANICAL GAZETTE [JULY 
tion of the unfertilized eggs. From the sporelings of both fertilized 
gametes and zoospores he obtained the filaments of Zanardinia 
which directly produce non-motile spores (Secundérsporen), a single 
one in each cell. In his cultures Desmotrichum appeared later, and 
consequently the ultimate fate of the sporelings and of the non- 
motile spores was not clearly determined. 
SAUVAGEAU (15) is one of those who have done most work on 
the Cutleriaceae, having been publishing the results of cultures of 
Cutleria since 1898. He has shown that the thallus of Zanardinia 
is formed through the union of marginal filaments, and has described 
in detail the dorsiventral structure and the general topography of 
the constituent cells. 
The first cytological paper was that of the writer, which was 
published as a preliminary note two years ago (21). The material 
was collected in the Bay of Naples in the winter of 1908 and the 
spring of 1909, during which time I occupied a table of the Carnegie 
Institution at the Stazione Zoologica. Zanardinia was found in 
the vicinity of Posilipo growing on the surface of rocks or sunken 
wooden blocks down to a depth of about 25 meters. Cultures of the 
plants and of their sporelings and fixation of critical stages were 
made in the laboratory of the Station. The study thus begun at 
Naples was finished at the Hull Botanical Laboratory of the Uni- 
versity of Chicago. 
The paper presents first the mitosis in the vegetative cells of the 
gamete-bearing plants, the formation of the gametes, the fertiliza- 
tion and germination of the fertilized female gametes, and the 
apogamous germination of unfertilized female gametes; then there 
: described the mitosis in the vegetative cells of the zoospore- 
ily heb a nae 
of teres oe statement concerning an alternation 
story of Zanardinia., 
Mitosis in the vegetative cells of the gamete-producing plants 
Gamete-producin 
