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CLUSTER-CUPS. 13<br />

in size from less tlian one-twelfth of an inch to half<br />

an inch in diameter. It is found on several species<br />

o^ Ranunculus J<br />

as R. acris, hulhosus, and repens, but<br />

most commonly on R. Jicaria.<br />

The leaf is thickened<br />

at <strong>the</strong> spot occupied by <strong>the</strong> parasite, and generally<br />

without indication on <strong>the</strong> opposite surface. Sometimes<br />

one spot, at o<strong>the</strong>rs several, occur on <strong>the</strong><br />

same leaf. The peridia are densely crowded toge<strong>the</strong>r,<br />

often arranged in a circinate manner,

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