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Rh FISSIDENS RAVENELII, Sulliv. Tab. 25. pusillæ, gregarie degentes, saturate virides, basi sola radiculosæ. simplex, 1–2 lineas longus, semilineam latus, erectus vel ascendens.

7–15-juga (in caule sterili 18–20), explanata lineari-oblonga, acuta, conferta, opaca; duplicatura ad medium producta, ilia floralium limbo latissimo grossius dentato instructa; lamina apicali, ut et dorsalis, baud limbata minute denticulata; reti densissimo e cellulis minutis subrotundis chlorophyllosis prominulis exstructo ; costa flexuosa hyalina sub vel cum apice evanida.

dioici, terminales: plantæ masculæ minutissimæ, 4–6-phyllæ; foliis perigonialibus ventricosis margine eroso-dentatis lamina apicali (dorsali obsoleta) instructis.

oblonga, erecta, aequalis, leptoderma, leniter papillulosa; operculo conico longius oblique rostellato; calyptra conica uno latere fissa.

Damp bricks and earth, Santee Canal, South Carolina, Ravenel. Moist ground, Society Hill, North Carolina, Curtis. This species is known by its opaque and densely areolated leaves, with their lamime minutely denticulate and immarginate, except those of the duplicature of the floral leaves, which have