

Igor | CURRENT LITERATURE 361 
NOTES FOR STUDENTS, 
W. A. WHEELER ® has published an ecological account of the vegetation 
of southeastern Minnesota in connection with a list of the species collected 
there. The paper is accompanied by several excellent heliotypes.—H. C. 
COWLES. 
E, M. WILCox has investigated? a rhizomorphic root-rot of fruit trees 
that is doing great damage to the peach, apple, and cherry trees of the south- 
west. The fungus concerned is described as a new species, C/itocybe 
parasitica, and is also found infesting oak trees. A very extensive bibli- 
ography and several plates accompany the report.— H. C. CowLEs. 
CORRENS has shown experimentally” that in Mirabilis Jalapa only one 
pollen grain out of five, and two ovules out of three, are fit, while in Mirabilis 
longifiora one pollen grain out of four, and one ovule out of two are fit. 
‘Therefore the chances of fertilization increase with the number of pollen 
grains used in pollination, and the progeny are stronger.—C. R. B 
IN A RECENT number of Engler’s yearbook ™ there is an account of the 
recent attempts to secure a uniform nomenclature in plant geography. 
Warburg’s address before the Berlin geographical congress in September 
1899 is given, as is also the resolution passed by the Paris botanical congress 
in 1900. Engler makes an appeal for contributions that will tend to clarify 
the various questions, offering to publish them in the yearbook. Particularly 
with reference to the use of the word “formation” is there need of a general 
understanding.—H, C. Cow.es. 
Von SCHRENK has published a preliminary report on diseases of New 
England conifers’ which contains a good deal of interesting material. 
General remarks are made on the conditions in the New England forests, and 
on the relation of fungi to forest problems. Several fungi, mainly Polypori, 
are described with especial reference to the mode of occurrence and the effect 
on the tree. A number of excellent plates accompany the report. Dr. von 
Schrenk’s work has often been noticed in this journal, and must be highly 
commended both for its botanical importance and its practical aspect. —H. C. 
CowLes. 
IN A SHORT paper entitled “A contribution to the natural history of 
marl, C. A, Davis™ shows conclusively that water plants, especially Chara 
® Minn. Bot. Studies, ser. 2, pt. 4. 1900. 
* Bull. 49, Oklahoma Agric. Ex. Sta. 1got. 
* Berichte d. deutsch. bot. Gesells. 18 : 422-435. 1900. 
**Eng. Bot. Jahrb. 29 : Beiblatt 66, 23-30. 1900. 
"* Bull. 25, U. S. Dept. of Agric. Div. of Veg. Phys. and Path. 1900. 
3 Jour. Geol. 8: 485-497. 1900. 
