. Minnesota maladies des plantes. Les maladies des plantes. Minnesota Maladies des Plantes. 133 Gus qui est étroitement liée aux deux derniers groupes de champignons et en particulier à la chenille champignon. Ce plaisir- gus exerce une action d'étrangler sur la plante hôte. Il apparaît comme une lumière blanchâtre ou de couleur beige anneau autour de la jeunes feuilles à l'extrémité de l'usine. Les filets bientôt une masse solide en- fermer les jeunes feuilles et pré- l'évacuation de dépliage. La branche sur laquelle le champignon est ainsi formé peut. finissent par mourir ofif. Lorsque le champignon a augmenté quelque peu en épaisseur le CCS-spore faire leurs capsules

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. Minnesota plant diseases. Plant diseases. Minnesota Plant Diseases. 133 gus which is closely related to the last two groups of fungi and particularly to the caterpillar fungus. This fun- gus exerts a strangling action on the host plant. It appears as a whitish or light-tan-colored ring around the young leaves at the tip of the plant. The threads soon form a solid mass en- closing the young leaves and pre- venting them from unfolding. The branch on which the fungus is thus formed may. ultimately die ofif. When the fungus has in- creased somewhat in thickness the sac-spore capsules make their ap- pearance as pear-shaped cavities on the surface of the fungus, just as on the clubbed stalks of the caterpillar fungus. The sacs and spores are also similar to those of this fungus in appearance. The accessory spore- forms appear on the fungus preced- ing the sac-spore forms. The life story in this fungus is thus seen to be simpler than in either the ergot fungus or the caterpillar fungus. No storage organs are developed. (Figs. 57, 58.) Other allies of the caterpillar fun- gus {Hypocreacece in part). Very cornmonly on the milk mushrooms are found fungi which cause the abortion of the gills of the host and which spread themselves out all over the latter, covering it with a bright red-orange color. On the surface reddish wart-like bodies can be seen and these are the spore- capsules which, as in the caterpillar fungus, open by pores to the sur- face. â The sacs are also of a similar shape but the sac-spores are not as long.. Fig. 58.âA strangling fungus. 1. A grass stem with a fungus fruit- ing body, part of which has been removed, showing the sac-spore- capsules in position. 2. A single sac, showing long thread spores. 3. A single spore. 2 and 3 highly magnified. 1 after Winter: 2 and 3 after Brefeld.. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustration

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