Pl. sori. [mod.L., ad. Gr. σωρός heap.]

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  1.  Bot. A cluster of capsules or spore-cases on the under surface of fern-leaves.

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1832.  Lindley, Introd. Bot., I. iii. 196. In a third tribe the sori occupy the whole of the under surface of the frond.

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1857.  T. Moore, Handbk. Brit. Ferns (ed. 3), 8. The part of the vein on which the sorus is seated.

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1876.  Harley, Royle’s Mat. Med., 360. Sori elliptical, imbedded in the substance of the thallus, concave on one side.

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  2.  A similar formation in algæ, lichens or fungi.

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1842.  Penny Cycl., XXII. 266/2. The term sorus is sometimes applied to mere collections of spores or granules, as seen in many Algæ, of which Delesseria alata and D. sinuosa are examples.

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1874.  Cooke, Fungi, 38. The pustules, or sori, break through the cuticle in a similar manner.

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