Hygrobiella 77 



maturity by the swelling of the enclosed fruit ; and the same would possibly ensue 

 with H. myriocarpa, of which we have as yet only the young and barren perianth.* 



3. Hygkobiella Nevioensis (Carr.) 



Jungermania Nevicensis Carr. in C. et Pears. Hep. Brit, exsicc. no. 

 85 fl879); ejusd. in Trans. Bot. Soc. Edinb. 1880, p. 464, t. 17, f. 2. 



Pallida, hie illic rubescens, siccando sordide flavida, csespitosa. 

 Caules sesquipollicares suberecti validi, cellulis pellucidis sub 6-stratis 

 (diametro 12 cellulas constante), corticalibus 24-seriatis elongatis, in- 

 ternis vix diversis, conflati, basi nuda rhizomatosi, flagella postica arhiza 

 edentes, superne sparsifolii, pro mores simplicea, rarissimo casu ramum 

 unum alterumve Interalem edentes. Folia distantia erecto-patula parva 

 ovato-rotunda subcomplicato-concava, basi subcordata, margine supra 

 medium in angulum, raro indentem, protracta, apice ad \ — \ acute 

 biloba, lobis acutis subacuminatisve, superiora brevius fissa, lobis sub- 

 obtusis ; cellulae minutse quadrate -hexagonse leptodermes, convexulse, 

 chlorophyllo parco. Foliola nulla. Flores utriusque sexus ignoti. — Folia 

 •35 X -35; cellules 'l7°mm^ 



Hah. Ben Nevis, on moist shelving rocks fJ. Whitehead ! July, 1876). 



A Cephalozia divaricata caule flagellifero arhizo et foliis brevilobis distat, et inter 

 Hygrobiellas sine dubio collocanda. Cum Cephalozia biloba, Lindberg, habitu et 

 magnitudine fere convenit ; differt autem haec caule radicelloso eflagellifero et foliis 

 magis profunde fissis. 



PLEUROCLADA nov. gen. 



Ab affini Hygrobiella differt colore glaucescente ; caule 

 tola longitudine subcequifoliato, basi nee rhizomatoso nee 

 flagellifero, subpinnatim ramoso ; ramis omnibus laterali- 

 bus, basi folio caulino difformi (monolobo) stipatis ; foliis 



*Since this account was drawn up, Mr. Pearson has found among his Westmor- 

 land specimens, gathered in June of last year, a ripe capsule, and has favoured me 

 with the following measurements and details of its structure. 



Capsula badia oblongo-globosa ; valvules -4 x •175mm tenues bistratse, cellulis 

 strati interioris fibris semiannularibus paucis depictis. Pedicellus diametro t, apice 

 •12 mm. Elateres -i x 'oi mm rufo-badii bispiri. Sporae diam. 'Oijs mm pallide 

 badise. 



