2 



The Naturalist. 



In Grlmmia Schulkii, the papillae are entirely wanting, and in tlie 

 tipper part of the leaf the margin only is composed of two or three 

 layers. Racomitrium patens has on the' back (on the underside) of the 

 carina, two, three, and four longitudinal laminse, and Racomitrium 

 papillosum is said to possess a " Nervus lamellosus," yet the original 

 shows no trace of one, but its carina resembles exactly that of Grlmmia 

 elatior. 



It has been customary, with regard to certain Grimmias, to speak of 

 a furrowed carina, but we all now know that in these instances, as a 

 matter of fact, they possess no furrow, but that the clear streak which 

 the extended leaf shows in the mediane of its rib when you allow the 

 light to fall through it {i.e. if you hold it before the light) has another 

 origin. 



In Racomitrium, patens and sudeticum the leaves have a one-layered 

 lamina, yet the leaf-margin of the first consists, in its upper part, of 

 two or three layers, with the last one sometimes of two layers. 



Grimmia /hnalis shows no papillas, and only the upper leaf-margin 

 consists of two layers. 



The papillose nature of Racomitrium protensum has already been 

 described by Lorentz. 



In Racomitrium canescens the papillae rest upon the lumen of the 

 cells ; in Grimmia anomala Hampe, on the contrary, upon the lumen,, 

 and also upon the cell-wall. 



Grimmia elatior forma suhinermis asperula (Sanio) Geheeb Beitrage 

 zur Moosfiora des Westl. Sibirens ("Flora" 1879, n. 30), B. asperulum^ 

 Geheeb, is doubtless the same form which has given occasion to the 

 creation of Racomitrium papillosum. 



NOTES ON SOME RARE BRITISH MOSSES. 



By James Cash. 



(Read before the Manchester Cryptogamic Society, 1st May, 1882.) 

 PALVBELLA SQUAEMOSA. 

 This moss was discovered by Mr. Wilson, at Knutsford, on the 16th 

 April, 1832. He had been to Yale Royal, and crossed to Knutsford 

 to observe the condition of the mosses previously found growing in the 

 bog. This entry in Mr. Wilson's diary is the first mention made any- 

 where of Paludella squarrosa as a British moss : " Found a new bryum 

 of the squarrose-leaved kind, very elegant, but barren." The next day 



