Nature and development of plants . Fig. 153. Fig. 154. Fig. 153. Head of rye infested by the parasite, Claviceps, which hastransformed several of the grains into black masses of mycelium knownas sclerotia. Fig. 154. Various phases in the life history of Claviceps: A, a younggrain or pistil infested with the parasite. B, enlarged view of the my-celium as it appears on the surface of the pistil, showing the formation ofnumerous spores. C, the hyphae of a sclerotium growing out and form-ing several purplish stalks, capped with knob-like clusters of , enlarged sectional view of one of t
Nature and development of plants . Fig. 153. Fig. 154. Fig. 153. Head of rye infested by the parasite, Claviceps, which hastransformed several of the grains into black masses of mycelium knownas sclerotia. Fig. 154. Various phases in the life history of Claviceps: A, a younggrain or pistil infested with the parasite. B, enlarged view of the my-celium as it appears on the surface of the pistil, showing the formation ofnumerous spores. C, the hyphae of a sclerotium growing out and form-ing several purplish stalks, capped with knob-like clusters of , enlarged sectional view of one of these knobs, showing numerous asco-carps on the periphery. E, one of the ascocarps enlarged, as, asci. F, anascus containing eight thread-like ascospores. 218 BROADLY OPENED ASCOCARPS known as ergot in the flowers of rye and other grasses (). The mycelium at first spreads over the outer part of thepistil, rapidly forming spores (Fig. 154, A, B) and exuding asweet slimy juice, honey dew, which is eagerly eaten by flies. Inthi
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