On wheat mildew (Puccinia graminis, Pers.) and its connection with the barberry aecidium (Ae. berberidis, Gmel.) / by Charles B. Plowright.

Plowright, Charles Bagge, 1849-1910.

Date:: 1882

Credit: On wheat mildew (Puccinia graminis, Pers.) and its connection with the barberry aecidium (Ae. berberidis, Gmel.) / by Charles B. Plowright. Source: Wellcome Collection.

Provider: This material has been provided by The Royal College of Surgeons of England. The original may be consulted at The Royal College of Surgeons of England.

9/16 (page 9)

$produced alone, and are not accompanied by the Mc.\~ (De Bary). The mouth of the flask is conical, and dium,* but this is an exceptional although not unique by pressure is easily split from top to bottom into Fig. 3.—^ecidium berberidis. a, Three cups ; b, An immature cup before its upper wall has ruptured ; c. Mature cup ; d. yEcidium-spores ; e. /Ecidium-spore just beginning to germinate in water; f, g, Germination more advanced (in water) ; k, ^Ecidium-spore which has germinated upon the cuticle of a Wheat-plant; i. Cuticle of Wheat, with two spores of ./Ecidium upon it, the germ-tubes of which are entering the stomata. (8 hrs.) occurrence. Each spermogonium consists of a flask- shaped body, sunk in the substance of the leaf, formed of exceedingly delicate threads about half the diameter of those of the mycelium, and originating from them * Cooke, Microscopic Fungi, edit. 4, 1878, p. sg. parallel fibres or elongated cells. The interior is filled with delicate threads which bear upon their ends chains of exceeding minute bodies, called sper- matia. The spermatia vary a good deal in size and form, some are elongated, others nearly spherical; they measure from 2 to 3 mk. by .5 to 2 mk. Their$