Diseases of plants induced by Diseases of plants induced by cryptogamuc parasites; introduction to the study of pathogenic fungi, slime-fungi, bacteria, and algae. English ed. by William G. Smith diseasesofplants00tubeuoft Year: 1897 AKCIDILM-FOILMS. 4o: ill the growth of the wood disturhs the elements, so that they are irregularly developed and more or less twisted. A mycelium inhabits the tissues of abnormal twigs ami cankered swellings. It grows in the intercellular spaces of the rind, between the bast cells and outer parts of the wood, and derives nutriment by means of haustoria : these
Diseases of plants induced by Diseases of plants induced by cryptogamuc parasites; introduction to the study of pathogenic fungi, slime-fungi, bacteria, and algae. English ed. by William G. Smith diseasesofplants00tubeuoft Year: 1897 AKCIDILM-FOILMS. 4o: ill the growth of the wood disturhs the elements, so that they are irregularly developed and more or less twisted. A mycelium inhabits the tissues of abnormal twigs ami cankered swellings. It grows in the intercellular spaces of the rind, between the bast cells and outer parts of the wood, and derives nutriment by means of haustoria : these either bore through tiie cell-walls, or only press closely against them so as to cause depressions. .Spore-formation takes place on the needles of the witches' brooms. The pycnidia (spermogunia) are produced on the upper side beneath the cuticle and emerge through it as little yellow points. The coiiidia (sper- matia) are tiny globose colourless bodies. The aecidia come later during June and July in irregular rows on the under side of the leaf. Tlieir peridia break out as low dome-like structures, the apices of which rupture irregu- larly to allow escape of aecidio- spores. In spite of numerous infections, I)e Dary was unable to observe the penetration of a germ-tube into needles or twigs of silver tir. Weise believes that infection of the fir takes place on twigs which have just emerged from the bud. As a preventive measure, all witches' brooms should Ije cut olf before spore-formation begins, and stemswith canker-wounds should be remo\id diiriii forest-thinninu. I'ny furtlii-r di-tails ibe moiKiLriaph of Heck may be consulted. Aecidium strobilinum (Alb. i-i Schw.)- (I5ritain). Spruce- I J4.;. ,.„c ..(,...'.,(,„,., I roni. (V. TulHJuf phot.) ' .\oti-. Fill till I , ot tlie aii;iti)iiiiciil rluiii;,'cs imliKril in tin- of tliewf witdifn' ht' iiiay )»»• olitaiiit-il in tlir . 4'J0-4'J1), i)f ill tlu' original hy liart
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