. j}ar •?, Fig. 244.—Aicidium Mrohiliiiura. 1, Cone-scale of Spruce with aecidia, those to left dehiscing their j-ellow spores, those to right still closed, (v. Tubeiif del.) •1, Section through an immature aecidium. 3, Part of 2 enlarged—pti-, peridium ; xp, spores; tw, intermediate cells; xplr, sporophores ; m, nij'celium ; jiai-, the scale-parenchyma. (After Reess.) The aecidia break out on the inner (rarely the outer) side of the bases of the cone-scales; each is enclosed in a firm brown lignified peridium, which ruptures by a cross-fissure and becomes an open disc. The young spores are jo

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. j}ar •?, Fig. 244.—Aicidium Mrohiliiiura. 1, Cone-scale of Spruce with aecidia, those to left dehiscing their j-ellow spores, those to right still closed, (v. Tubeiif del.) •1, Section through an immature aecidium. 3, Part of 2 enlarged—pti-, peridium ; xp, spores; tw, intermediate cells; xplr, sporophores ; m, nij'celium ; jiai-, the scale-parenchyma. (After Reess.) The aecidia break out on the inner (rarely the outer) side of the bases of the cone-scales; each is enclosed in a firm brown lignified peridium, which ruptures by a cross-fissure and becomes an open disc. The young spores are joined by small intermediate cells, which are gradually absorbed to form a layer of gelatinous lamellae on the spore-coats (Fig. 244). Teleutospores of this Aecidium are unknown.

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Photo credit: © The Bookworm Collection / Alamy / Afripics
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectparasit, bookyear1897