34 APLOPERISTOMI. [Tetraphis. 



T. ovata. ed. I. (excluding the synonyms of Hoppe and Sclnvae- 

 grichen.J. Hook. Fl. Lond. n. series, cum Ic. Hobs. Brit. Mosses, v.^ 1. 

 n. 9. Hook. Fl. Scot. P. II. p. 124. 



Bryum Brownianum. Dicks. Crypt. Fasc. 4. t. 10. f. 16. 



Orthotrichum Brownianum. Smith, FL Brit. p. 1269. 



Grimmia Browniana. Engl. Bot. t. 1422. 



HAB. Rocks, particularly of sandstone in the north of 

 England and Ireland. Discovered at Rosslyn near 

 Edinburgh R. Brown, Esq. ; also in other parts of 

 Scotland, abundantly. In Devonshire, near Harrow- 

 bridge Rev. J. Tozer. 



Although possessing the true generic character of a Tetra- 

 phis, the general habit of this individual, and the form and 

 structure of the leaves, are totally diiferent. In size the whole 

 plant, (including the fruit,) rarely exceeds half an inch. /Stems 

 scarcely any. Outer leaves very few, half as long as the fruit- 

 stalk, linear, or only a little swollen and dilated upwards, thick, 

 rigid, dotted. Inner, or perichcetial leaves broad, ovate, con- 

 cave, rigid, with a faint nerve at the base ; all of them of an 

 olive green colour inclining to brown. Sir J. E. Smith, misled 

 by the appearance of the Calyptra, at first placed this plant 

 among the Orthotricha, and afterwards with the Grimmice / and 

 in English Botany the peristome is represented with 8 double 

 teeth, or 16 placed in pairs. 



We too, have fallen into a mistake in the earlier edition of 

 this work in considering this species to be the same with the 

 Tetraphis ovata of Hoppe, and of all continental writers, for we 

 had imagined, the linear leaves not having been noticed by them, 

 either that they had overlooked them entirely, or that they 

 had considered them as not belonging to the plant. Now, 

 we are assured by our friend Dr. Hornschuch, and we have the 

 tacit authority, too, of every German Muscologist, that the 

 continental Tetraphis ovata is never found with linear leaves ; 

 whereas, on the contrary, our British plant has never in any 

 situation been sqen without them. Under these circumstances 

 we cannot do otherwise than pronounce them distinct, and we 

 have great pleasure in restoring the original specific name* 



* It is but justice to Mr. Arnott here to publish a remark which has, sine;; 

 the above was written, been communicated to us by that gentleman. " At 



