Algae. — Fungi. 649 



keit zu grösseren Zellcomplexen heranzuwachsen, an denen nach 

 etwa 5 Wochen seitliche Sprossen auftraten, wie sie sich an 

 der Keimpflanze zu entwickeln pflegen. Auch an jugendlichen 

 Keimlingen war die Erscheinung zu beobachten, nur zeigte sie 

 sich hier unter den gleichen Bedingungen nicht so schnell wie 

 an alten Pflanzen, und der Auflösungsvorgang verlief auch 

 etwas abweichend. Schliesslich wird noch angegeben, dass auch 

 die Zellen der Rindenschicht der polysiphonen Axe repro- 

 ductionsfähig sind. Winkler (Tübingen). 



Halsted, Byron D., Notes on Plant Diseases. (New Jersey 



Experiment Station Report. 1901.) 



The blight (Septoria Lycopersicae Speg.) was the only disease pre- 

 valent on tomato plants during - the year. Chard was injured by the 

 leaf spot (Cercospora beticola Sacc). Spraying lessened the loss of 

 toüage. The asparagus rust (Puccinia asparagi DC.) was not so inju- 

 rious as in the previous year. This may have been due to one or more 

 causes, among which the following are given: 1) the increased heat and 

 moisture oi the season favoring the resistance of the host; 2) the preva- 

 lence of the fungus Darlnca parasitic lipon the rust. The varieties of 

 asparagus known as „Palmetto" and „Argenteuil" were less affected than 

 other varieties. The clover broom rape {Orobanche minor J. E. S.) was 

 reported from one locality. A different species of broom rape, Orobanche 

 ramosa L., was common upon tomato plants about the Station, attaching 

 itself, as in case of the former, to the roots of the host plant. The 

 Jatter Orobanche is thought to be the same species as that found on the 

 roots of hemp and tobacco in Kentucky. Ergot was common on Phalaris 

 arnndinacea L. Com smut was more than usually abundant. The mildew 

 {Plasmopara Cubensis B.) of the melon and cantaloupe was prevalent 

 and destructive. Tulips in one locality were killed by a root disease 

 caused by Botrytis parasitier Cov. G. G. Hedgcock. 



MASSEE, G., Larch and Spruce F i r Canker. (Journal of 

 the board of Agriculture London. IX. Sept. 1902. p. 17b 

 — 188. 3 Plates.) 



Observations and experiments concerning the 2 destructive parasites 

 Dasyscypha calycina (Fuckel) and D. resinaria (Rehm). 



D. calycina is responsible for the widespread devastation of Larches 

 oi late years ; it is a wound parasite and gains entrance through wounds 

 caused by frost, insect punctures, etc., almost exclusively in the month 

 of May. 



The following is an extract from the summary. „The larch is most 

 susceptible to canker when quite young, and as the fungus spores in the 

 majority of instances gain an entrance to the living tissues through 

 injuries caused by the larch aphis : Chermes laricis (Hedwig), it follows 

 that seedlings and young trees should be protected against this 

 pest. This can be accomplished by spraying in the spring with paraffin 

 emulsion." 



„Recent investigations tend to show that the spruce gall aphis: 

 iChermis abietis L) and the larch aphis: (Chermes laricis) are alternating 

 stages of one species. The sexual generation occurs only on the spruce, 

 and the agamic generation consisting entirely of females then migrates 

 to the larch. Under the circumstances a mixture of spruce and larch is 

 not to be recommended, as it furnishes the aphis with its two necessary 

 host plants " 



„As a safe guard against inoculation taking place through bark 

 Hssures caused by late frosts, it is advisable not to form seed-beds, nor 



