ON RADULA GERMANA, JACK. 229 



leaves singly. The plant gives out in water a pale yellow 

 colouring-matter like several of the other FmcIuIcb. 



Amongst a collection of Hepatka sent me by Mr. G. A. Holt, 

 of Manchester, made on the Breadalbane Mountains, July, 1880, 

 was a Rathila which appeared to be quite distinct from any of the 

 European species known to me, so I named it provisionally 

 RaduLa anyustata on account of its narrow graceful stems, and as 

 such sent it to Dr. Gottsche, who wrote me — "I have seen your 

 Radula anyustata, and have made a drawing of it in two sheets in 

 quarto. 1 have only found 7 barren archegonia in the involucral 

 leaves with propagula. I have been puzzled very much this year 

 (1881) with drawing nearly 100 plates of Radula, which amount 

 nearly to 70 species. We have a form in Germany which has not 

 the monoicous character of Radula cotnplanata, the male plant of 

 which is not known ; the calyx is somewhat different from it also, 

 and so is the mode of branching, otherwise it is only found 

 propaguliferous. " 



To my friends Gustav Limpricht and J. A. Jack I forwarded 

 specimens, both of whom assured me that my Radula anyustata was 

 a species known as Radula coiinnutata, Gottsche, but as yet un- 

 published ; so under that name I brought it before the Manchester 

 Cryptogamic Society, and it was included in the list of species in 

 the London Catalogue. 



Eecently Jack has published a monograph on the European 

 Radulce, and after the comparison of original specimens and from 

 Herr Jack's description I have little hesitation in referring all the 

 Scotch alpine specimens to his Radula yennana, a species which 

 Jack himself says "stands very near to Radula commutata in many 

 relations, and from which it is often difficult to distinguish it." 

 In a recent letter J. A. Jack says, " Radula cummutata, which is 

 peculiar to the plains, is perhaps only a variety of Radula yennana, 

 which grows upon the mountains and the alps ; but until one has 

 found the male plant of Radula commutata in the plains itself, 

 one is not able to judge with any certainty." I should myself 

 rather say that Radula yennana is the alpine variety of Radula 

 commutata. 



Since my attention was directed closely to this species I find 

 I have in my herbarium specimens collected from the Breadalbane 

 station two years previously by Mr. C. J. Wild, who forwarded me 

 specimens to name, which I neglected to examine. I have also 

 spccmens collected some years ago by Mr. George Davies, Loch- 

 na-Gat, Ben Lawers. Dr. Carrington has in his herbarium the 

 same species, collected in 1860 in Forfar by Mr. A. Croall. It may 

 probably be found in other herbaria, being overlooked as a form of 

 Radula complanata, Dmrt., from which it differs in its inflo- 

 rescence, &c. 



Radula alpestris, Berggren, which, being like Radula yennana an 

 alpine species, might be confounded with it, is only a form of Radula 

 complanata, being parvicous (Lindb. Acta societatis scientarum 

 fennicse, x., p. 491). 



