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Lecture 9. Then the Low, Minute Forms and Confervæ Come, and Gory Dew,

Letters of Asa Gray · Asa Gray — chapter 5 of 7 · ~20 words · public domain

red snow, superbly illustrated, ending with diatoms, transitions to corallines through sponge, etc., and the locomotive spores of Confervæ, Zoösporæ.

Letters of Asa Gray · The Wunder Library — complete classics, free to read, with narration.