JDR. LINDBEBG's C0^TB,IBUXI0N8 TO BRITISH BEYOLOGT. 463 



The Tortula in question is highly interesting from its truly 

 axillary fruit-stalk, not "lateral by the quick and continued 

 growth of innovations/' because the perichsetia are, from the 

 beginning, developed in the axils of the leaves, and not at the 

 top of the stems ; the bracts are also, as in pleurocarpous mosses, 

 accrescent in size towards the middle of the perichaetium. It 

 must therefore be separated from the true acrocarpous Tortula?, 

 as a proper genus, PleurocJicdte, Lindb. (Efv. V. Ak. Forh. xxi. 

 p. 253. no. 9 (1864), possibly including also some other Tortulcs 

 with serrated leaves, as T, serrulata, H. Gr., robusta, H. G., and 



densifolia, H. f . & W 



This genus 



Mielichhqft 



Zeptochlcena, and Goniohruum, Lindb. in op. cit. xxi. p. 606. 



Mitt 



1868), do to Bryum—Anoectangium to Zygodon — Bhizogonium 

 and Mesochcete^ to Mnium — Hymenodon to Georgia — and Bhaco- 

 carpus, Lindb, in op. cit. xix. p. 607. no. 8 (Harrisonia, Schpr. 

 1S60, but not E. Br. 1825), to Braunia, &c- 



IV. Trichostomum diffr actum, Mitt. 



I have received from Mr. G-. E. Hunt an English moss, called 

 by Mr. Mitten Trichostomum diffractum, n. sp., and had previ- 

 ously the same form (gathered by Mr. Nowell) from K. Spruce, 

 Esq., who has most generously favoured me with the half of his 

 collection of European mosses. This specimen was thus labelled : 



hrachydontius^^^ 



Mr. Wilson 



recogniz 



following characters : — The tufts are short, very dense, and 

 nearly hemispherical, of black-green colour ; the stems united 

 below by masses of dark brown tomentum ; the leaves closely 



■ * Mesoch.£te, n. gen., Lindb, Perichaetium axillare, bracteis accrescentibus. 

 Capsula horizontalis, obliqua, pachydermis, jxigata. Peristomiura duplex, 

 ciliis interni teneri maxime appendiculatis. Calyptra ? Androecium gem- 

 miforme, axillare.— Planta robustissima, elata, erecta, simplex, compressa ; 

 foliis quadrifariis, conformibus, obliquis, catilagineo-limbatis, cellulis mi- 

 nutis, rotuntis, IsBvissimis. 



1. M. uxDULATA, n. sp., Undb, Dioica, foliis undulatis. 



Hab. in New Enirland, inter 30-32° lat. aust, AustraUa medio-oricntalis 



Mueller, 



Wales): banc stirpem parce fmcticantera 



2 I 2 



