i THE JOURNAL OF BOTANY 



Hajjlodontium Notarisii (Mitt.)' Broth. Barraiico above Arafo 

 (no. 5), c. fr. 



Ejn-pterygium Tozeri (Grev.) Lindb. Fuente la Kosa (no. 29). 



Bryum argenteum var. lanatum B. & S. Santa Ci'uz Eoad, 

 Guimar (no. 25). — B. Donianum Grev. Guimar (no. 32), c. fr. 



Bryum (Eubeyum § Trichophoea) validicostatum, Card. & 

 Dixon, sp. nov. (Tab. 509, fig. 1.) Caespites densi, humiles, circa 

 1 cm. alti, pallide virides, subnitidi, getate rufescentes. Caulis sat 

 crassus, in sectione transversa subpentagona, fasciculum cen- 

 tralem magnum, rete laxmia tenue, cellulas externas 1-2 seriebus 

 minores, incrassatas, ptilcherrime rubras exhibens. Folia caulina 

 valde conferta, humida regulariter imhricata suberecta, sicca ad- 

 pressa, imrum mutata, ])aullo contracta, nullo modo torquata, unde 

 caules crassiuscule clavati teretes ; comalia densissime conferta, 

 2-2-5 mm. longa, 1 mm. lata, late oblongo-ovata, subol)tusa, nullo 

 modo acuminata, perconcava, marginibus per totam fere longi- 

 tudinem fortiter anguste recurvis, apicem versus denticulatis. 

 Eete laxum, e cellulis elongate hexagonis, 60-80 /x longis, 20-25 /x 

 latis, parietibus firmis, baud incrassatis instructum, marginalibus 

 in 2-4 seriebus perangustis, limbum angustum unistratosum lute- 

 scentem distinctum efformantibus ; cellulae apud basin baud de- 

 currentem laxiores, rectangulares, saepe rubellse. Costa validis- 

 sima, OBtate purpurea, ad basin 150-180 [x lata, inde cito angus- 

 tata, apud mediam partem folii 60-80 /a lata, apice in cuspidem 

 lutescentem subintegrum exiens ; in sectione transversa plano- 

 convexa, dorso maxime prominens, prope basin 2-4 cellulis ven- 

 tralibus magnis, ducibus 3-4 multo mii:ioribus, fasciculo comitum 

 parvo, stereidearum permagno, cellulis dorsalibus circa 8, trans- 

 versa ellipticis, majusculis. Innovationes graciliores, foliis mi- 

 noribus, minus confertis, vix comatis, aliquando paullo lenissime 

 torquatis. 



Dioicum. Seta et theca illis B. Doniani et B. i^latylomatis 

 similes ; operculum magnum, alte acute conicum. Spori 10-13 ji. 

 Peristomium pallide aurantiacum, dentes lamellis circa 30 dorso 

 brevissime acutissime prominentibus, endostomii meinbrana pal- 

 lida, 'prcealta, processus breviores, cilia nodosa, vix appendiculata. 



Hab. Barranco del Eio, Feb. 1909 (no. 19). Eisco de Fio- 

 marcial, Feb. 1909 (no. 6). Mons. Cardot informs me that he also 

 possesses the same plant from the Azores, leg. Carreiro ; and that 

 the plant recorded as B. Teneriffce by Schiffner [Bornmiiller, 

 no. 1673, and by implication also, no. 1680, from Monte (Tafera), 

 Gran Canaria] , also belongs here (cf. Schiffner, " Neue Materialen 

 .... der Atlantischen Inseln," Hedwigia, xli., 288). Probably 

 some other records for B. TeneriffcB may also properly belong to 

 this species. 



The affinities of this plant are with B. Tcneriffa Hampe, B. 

 platyloma Schwaeg., and B. Doniamivi Grev. ; but it appears to 

 be quite distinct. B. Donianum differs at once in the thickened 

 border, and the leaves usually twisted when dry, B. ylatyloma in 

 the wdde border and spirally twisted leaves. It is, I think, even 

 more distinct from B. Teneriffce, which appears to have been some- 



