226 BOTANICAL GAZETTE 
versity of Ziirichy The taxonomic presentation is preceded by an excellent 
account of the morphology and anatomy of the genus. The twenty-nine 
species, five of which are new, are treated with remarkable fullness, an aver- 
age of four pages being given to each one. Fourteen excellent lithographic 
plates, some of them colored, accompany the paper.—R. I. Crarry in Bull, 
Lab. Nat. Hist. lowa(4 : 313-375. pls. ro. 1898) has published a list of lowa 
sedges, with synonymy and distribution. It contains -1 14 species and varie- 
ties, representing ten genera, Carex containing 78. Following the list are 
some interesting tables comparing the Iowa sedge flora with that of neigh- 
boring states.— W. N. SuksporF has published in Deutsche bot. Monat 
Schrift (16 : 220-222. 1898) an account of certain Washington species of 
Claytonia, which he refers to Montia and renames. — An enumeration of the 
species of plants collected by Dr. W. C. Shannon in Central America in con- 
nection with the survey of the Intercontinental Railway Commission has been 
published by JoHN DoNNELL SMITH (Intercont. Railway Com. 1: part 2. 
appendix 3. pp. 1-24. 1898. Washington.)—J. M. C. 
Mr. V. H. BLAcKMAN, in his study of Pinus sylvestris® has made an 
important contribution to our knowledge of the subject of fertilization. 
Beginning with the formation of the ventral canal cell, the processes ate 
traced with considerable detail up to the early stages in the formation of the 
Sporophyte. During the great increase in size which the oosphere nucleus 
undergoes previous to fertilization, it becomes filled with a metaplasmic sub- 
stance, at first granular, but in later stages taking the form of an elaboralé 
reticulum, which might easily be mistaken for chromatin. The true chro 
matin, however, consists of a few small, rod-shaped masses. 
The entire contents of the end of the pollen tube pass into the oosphere. 
The four nuclei are plainly visible as they enter the egg, but it is impossible 
to distinguish the stalk nucleus from the tube nucleus: As the sex nucle! 
ment of the ordinary cytoplasmic reticulum. 
ie} 
vestris. Phil. Trans. Royal Soc. London 190: 395-426. 1808 
+ 
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in Pinus sy 
On the cytological features of fertilization and related phenomena in 
