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Rh TREMATODON LONGICOLLIS, Michx.

Tab. 19.

brevicaules, copiose fructigeræ, in cæspitibus laxiusculis degcntos, læte virides.

3–6-linearis, subsimplex, dense longifolius.

patentia, flexuosa, e basi oblonga longc setacea, canaliculata, apice obtusiuscula, obscure dcnticulata; costa lata percurrente; areolatione infernc e cellulis oblongis pellucidis, supernc minoribus opacis exstructa: perichætialia majora, erecta, lanceolata, sensim longe attenuata.

monoici: masculi in ramis plus minus brevibus basilaribus terminales; perigonialibus e basi colorata ovata setaceis; antheridiis 4–6 paraphysatis.

elongato-oblonga, inclinata, in collum angustum curvulum, basi latere interno abruptum, ipsa fere duplo longiorem defluens; pedicello tenui subunciali luteo; peristomii dentibus subulatis nodoso-articulatis inter articulationes pertusis striolatis, cruribus insequalibus interdum secedentibus; annulo composito revolubili; operculo subulirostro; calyptra inflato-cuculliformi.

Clayey or sandy and moist soil, Southern States.

T. longicollis appears to be confined, in this country, to the more southern States, and to the sea-coast thence to New Jersey; it occurs likewise in New Zealand and Japan. The plant found in Massachusetts, Middle Pennsylvania, and Northern Ohio, and heretofore referred to this species, is T. ambiguus,—a native also of Europe,—which, though very closely resembling T.