Hypertext Webster Gateway: "conferva"
From Webster's Revised Unabridged Dictionary (1913) (web1913)
Conferva \Con*fer"va\, n.; pl. {Conferv[ae]}. [L., a kind of
water plant. See {Comfrey}.] (Bot.)
Any unbranched, slender, green plant of the fresh-water
algae. The word is frequently used in a wider sense.
From WordNet (r) 1.7 (wn)
conferva
n : any of various algae of the genus Tribonema; algae with
branching filaments that form scum in still or stagnant
fresh water
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