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34 FISSIDENS HYALINUS, Hook, et Wils. Tab. 21. perpusillæ, tenerrimæ, gregarie vel cæspitulose degentes, glauco-virides.

1–2 lineas altus, simplex, erectus vel declinatus, basi radiculis hyalinis copiose instructus.

mollissima, explanata, 3–4-juga, inferiora minima, superiora mnlto majora, lanceolata, oblongo-lanceolata, interrupte anguste marginata, e cellulis amplissimis hyalinis hexagono-areolata, duplicatura ad medium producta; lamina dorsali lata ad basin evanescente; costaomnino deficiente.

dioici: feminei soli noti, terminales, diphylli.

oblonga, erecta, macrostoma, leptoderma, brevius pedicellata; peristomii dentibus gracilibus rubellis solidis dense articulatis; calyptra cylindraceo-conica operculi rostrum longiusculum solum tegente; sporis minimis.

"Moist, rocky ledges, Bank Lick, on Cassidy's farm, near Cincinnati, Ohio." T. G. Lea. This species, remarkable for the absence of a costa in its leaves, has been found only by the late Thomas G. Lea, who detected it in the year 1839. It has since been carefully searched for in the locality above mentioned, but without success.

TAB. 21.—