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Rh DESMATODON ARENACEUS, Sulliv. et Lesqx.

Tab. 29.

humiles, gregariæ vel in cæspites cxtensos densos congestæ, quam maxime fructiferæ.

4–10-linearis, simplex vel innovando-ramosus, densius foliosus, basi radiculis longis copiose instructus.

inferiora incumbentia, ovato-oblonga; comalia multo majora, e medio patula, ligulato-oblonga, obtusa, breviter apiculata, canaliculata, margine superiore papilloso-crenulato revoluta; cellulis inferioribus oblongis laxis hyalinis, superioribus minutis subquadratis valde chlorophyllosis, utraque pagina versus apicem papillosis; costa valida tereti cum vel sub apice desinente.

monoici: masculi in ramis (interdum delapsis plantas proprias sistentibus) terminales.

elongato-cylindracea, erecta, recta vel curvula, late annulata; peristomii dentibus sedecem e membrana lata ortis albidis punctulatis remote articulatis discretis vel e basi fere ad medium cohærentibus, dehinc liberis, inæqualiter bicruribus; operculo brevi elongato-conico obtuso; calyptra dimidiata longirostra.

Sandstone rocks, Central Ohio.

This species resembles very closely D. flavicans, ''Bryol. Europ.'', except in its peristome, which is quite short and fragile, consisting of sixteen straight white granular teeth, cohering from their