210 BOTANICAL GAZETTE [SEPTEMBER 
of papers entitled “Observations on the eucalypts of New South Wales.” 
The last one issued (Proc. Linn. Soc. 4 : 612-630. pls. g8—50. 1900) is the sixth, 
and includes descriptions of three new species.— E. P. BIcKNELL (Bull. Tor. 
Bot. Club 27 : 373-387. 1900), in continuing his “Studies in Sisyrinchium,” has 
revived Salisbury’s genus Hydastylus to receive the yellow-flowered S. Calé 
fornicum, and has associated with it 11 other species, 9 of which are described 
as new.— K. M. WIEGAND (id. 388-391) has described two new species of 
Saxifraga and one of Primula from the northwest.—C. V. PIPER (tbid. 392- 
401), in continuing his ‘New and noteworthy northwestern plants,” describes 
new species of Amedanchier, Potentilla, Saxifraga (3), Townsendia, Erigerm, 
Castilleia (2), and Salix (2).— KATHARINE BRANDEGEE (Zo€ 5 : 31-35: 1900) 
in her third paper entitled ‘“‘ Notes on Cactez,” describes two new species of 
Mamillaria, besides giving critical notes on several other forms.— C. WARS 
storF (Hedwigia 39: 100. 1900) has described four new Sphagna from Vit- 
ginia and North Carolina collected by T. H. Kearney.—J. M. ©. 
Mr. HAROLD WAGER has published the results of his study of the fertil 
ization of Peronspora parasitica,’ his conclusions being as follows : the prot: 
plasm of the oogonium differentiates as usual into vacuolate ooplasm and 
granular periplasm ; a receptive papilla is formed on the oogonium in contact 
with the antheridium and is penetrated by the antheridial tube: the nuclei o! 
the oogonium and antheridium undergo mitosis before fertilization ; soon alte! 
the delimitation of the oosphere the central body appears, which seems '° 
play some part in bringing the sexual nuclei together ; a single nucleus from 
the periplasm travels towards the central body, coming in close contact wit 
it, and towards it the antheridial tube advances and discharges # - 
nucleus ; fusion occurs while the nuclei are in the resting stage and ne a 
the oospore is nearly ripe; the central body disappears before fusion, 
ripe oospore is uninucleate ; no difference is observable between gs " : 
nucleus and those that remain in the periplasm, all probably being .. 
tially sexual; three types of fertilization and oospore-formation . oe 
€ronosporee may be distinguished, as follows: (1) uninucleate it 
binuclear fusion, and uninucleate oospore (?. parasitica) ; (2) unin é 
Sosphere, binuclear fusion, and multinucleate oospore (¢- eee 
Pett and P. Ficariae),; (3) multinucleate oosphere, multin 
idl pak and multinucleate oospore (C. Blitt).— J. M- C. a 
A PRELIMINARY paper by Lidforss’? records some interesting eae 
upon the chemotropism of the pollen tube. Varcissus Tasetta fu : 
material for most of the work. da piect 
If the pollen be placed in a 5-15 per cent. sugar-gelatin solution an ail : 
of stigma be added, the pollen tubes soon turn toward the stigma, a : tt 
. of Botany 14:263-279. p/. 16. 1900. — (vor 
Mittheilung.) 1 B.: Ueber den Chemotropismus der Pollenschlauch® | 
8-) Ber. d, deutsch. bot. Gesell. 17: 236-242. 1898. 
