2GG THE JOUEXAL OF B0TA5T 



Bryi'm pallets S\v. var. eueypiiyllum. 



Bryum pallens Sw. occurs frequently along the western sea-coast 

 of North Wales, where its reddish tufts make it a prominent moss on 

 our sandy tlats. A remarkable form grows among the sandy detritus 

 along both banks of the River Glaslyn : this ground is subject to 

 ])eriodical inundation during high tides or heavy rains. It has a 

 considerable resemblance in its leaves to B. cidophyllum R. Br., but 

 the lower leaves on some of the stems are distinctly typical of 

 B. pallens. Mr. Wheldon suggests in the Report of the Moas 

 Exchange Club for 1917 that it may possibly be B. pallens X calo- 

 'phyllum, but I have seen no evidence of hy])ridity among the B. calo- 

 pliyllum which was found growing and fruiting freely in the same 

 spot by the Rev. P. Gr. M. Rhodes last August. The leaves are 

 large, sometimes as broad as long, very concave, obtuse, strongly 

 recurved and less decurrent. The cells are also much smaller and 

 often subquadrate at margin in few narrow rows forming less dis- 

 tinct border, occasionally bistratose. The nerve is thick, excurrent 

 in a short mucro or vanishing at or just below the apex. Hitherto 

 only male plants have been found. The typical form of B. pallens 

 is scattered over the same area : — 



Brijum pallens Sw. var. eiirypliyllum mihi. 



Ca^spites laxi molles la3te-virescentes, rubore quodam suffusi ; 

 caules brevissimi, paucis ad basim radiculis ; folia distantia, siccitate 

 minus crispata, majora, nonnunquam tam lata quam longa, admodum 

 concava, obtusiora, valde recurvata, minus decurrentia ; celluhe 

 nmlto minores, sajpe subquadratse, parietibus crassis, . seriebus paucis 

 marginem versus limbam distinctam exhibentibus ; costa valida, in 

 niucronem brevem excurrens, aut in apice vel immediate subtus 

 desinens. MasculinsE' plantulaj tantum inventa?. 



Hah. — In detritu arenoso sa?pe inundato prope mare juxta 

 flumen Glaslyn, in comitatibus Carnarvon et Merioneth. 



POROTRTCHUM ALOPECURUM Mitt. Var. ARIDULVM. 



The two marked forms of Porotriclium alnpecurum Mitt. (Tham- 

 niiim alopecunim B. & S. auct. plur.) mentioned in the Handbook to 

 British llosses, occur in North Wales — the terrestrial with non- 

 complanate branches, curved, robust and with more spreading leaves ; 

 ;ind also the rupestral form with distinctly' complanate branches, 

 straighter, more slender and tiagelliform with smaller appressed 

 leaves. A plant which grows on dry rocks at Harlech differs from 

 the two forms above mentioned; much resembling Eurhynchiuni 

 onyosuroicles Schp. in size and appearance. It forms extended, 

 ))r()strate tufts on the .surface of the rocks and does not show the 

 dendroid habit of the type. The secondary branches are neither 

 curved nor complanate. The lower stem leaves are exceedingly small, 

 with the nerve shorter, sometimes very faint, almost wanting. The 

 branch leaves are narrower, crisped when dry, the cells rounded or 

 subquadrate to the base and the nerve occasionally^ bitid. Mr. Dixon 

 has sent me a remarkable form from cliffs by a waterfall, near 

 Erwood Bridge, Brecon, South Wales. It is a larger ])lant and bears 

 a closer resemblance to the type in all its parts. He has also drawn 



