290 RECKNT ADDITIONS TO OUR MOSS FLORA.
CXIX. f. 2). Dioioons ? in large dense tufts, interwoven at base with ])ranclied radicles, bright green. Stem innovating dichotomously 1-2 in. high, flexile, reddish, bearing lax radicles at the lower part from the axils of the leaves. Leaves approximated, erect when moist, and often some- what secund on the young shoots, rather soft, papillose at back, from a narrowly lanceolate base, gradnally subulate, channelled, with a thin nerve reaching the apex, the margin not revolute, sharply denticulate above and on the back of the nerve ; when dry strongly cirrhate and twisted. Cells at base large cylindraceo-vesieidar, the rest small quadrate or subhexagonal, filled with deep green chlorophyll. Growing in ex- panded tufts like TF. cirrhata, the leaves resembling those of TF. Bruntoni, but longer and the margin not revolute. — Hab. On the base of the trunk of an oak in Lower Nuthurst, Sutton Park, Birmingham (J. Bagnall, Aug. 27, 1870). Identical with original specimens gathered by Carestia in the Val d'Intrasca near Verbano.
Trichostonu'Oi.
As the synonymy of this group has been so carefully worked out by Professor Ijindberg in his valuable paper " Om de Europeiska Tricho- stomea? " (Oefversigt Kongl. Yetenskaps Akad. Porhandlingar, 1S64), I take advantage of it to enumerate all our species, availing myself also of Mr. Mitten's admirable paper on Fottin (See Journ. Bot. IX. (1871) p. 2). This great bryologist takes by far the most philosophical view of the group when he advocates the union of Pottia, Desmaiodon, Tricho- stovuim and Turlnln, into one natural genus ; as a matter of convenience, however, I retain here the three principal, though every one who studies them will find that the lengthening of the teeth of Trlchodomvm, and their twisting into those of Torlalci, is so gradual that it is difficult to draw the line between them, while it separates such closely allied species as Tri.ch. cyjiiidricum and Tort, turtnosa. In Turtula I adopt the sections used by De Notaris.
Tjpliemerella rt-curvifoHa , Dicks.
Phascum. — 1, P. triquetnim. Spruce ; 2, P. muticum, Schrcb. ; 3, P. Plbrknanum , W. and M. ; 4, P. acaulon, L. {cuspidatnm, Schreb.) ; 5, P. curvlcoUiim, Hed.
Pottia,— 1, P. pusilla, Hed. 1782 {cavifdia, Ehrt. 1^87); 2, P. recta, Liiulb. {Phascnm rectum. With.) ; 3, P. Starkennn, lied. ; 4, P. cccspitoHn, P)ruch ; 5, P. tnoicatnla, L. ; 6, P. crinita, Wils. ; 7, P. TFllaoni, Hook.
8. P. llttoralh. Mitten, Journ. Bot. IX. (1871), p. 4. Leaves q\iin- qucfarious. oblong, subspathnlate, the lower pale, upper green ; upper cells half the size of those in P. triivcatula, lower oblong pellucid, all sm )oth ; nerve excurrent. Capsule oblong-oval, somewhat narrower at the mouth, lid rostrate, slightly twisted, male flower gemmiform. Beach at Aldrington and Hastings. I have not seen specimens.
9. P^anpernla, Mitten, Journ. Bot. 1871, p. 4 (Plate CXIX. f. 3). Leaves quinquefarious, obovate-spathulate, acute, upper cells rhomboidal and quadrate hexagonal with obtuse papillae, lower oblong, pellucid, nerve excurrent. Calyptra with a fevv scattered papilla3 ; capsule oval ; lid rostrate, antheridia naked in the axils of upper leaves. — Hab. Henfield Mitten ; Penzance, Cvu-now ; Jersey, Piquet.
10. P. vlridlfolla. Mitten, Journ. Bot. 1871, p. 5 (Plate CXIX. f. 4). Leaves octicfirious, obovate-spathulate, obtuse, nerve excurrent, margin
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