io8 ANNALS OF SCOTTISH NATURAL HISTORY 



the primordial utricles, size 1 6 to 25 by II to I 5 //,, near 

 apex somewhat smaller. 



The general cell formation of One. polycarpus is rather 

 irregular, and 8 to I 2 /A, diam., while the cells near the base 

 are narrower than in the present moss. The capsules seen 

 are too old, but the characteristic red teeth of the genus are 

 well preserved, while the other characters agree so far as they 

 go, more especially in the inclined and furrowed capsules 

 and absence of any struma. The immature capsules show a 

 peculiar slender annulus just below the attachment to the seta. 



Since writing the above I have ascertained that Mr. 

 H. N. Dixon of Northampton has published a description 

 of this same Oncophorus under the name Cynodontimn 

 laxirete (Dixon). This name has accordingly the priority. 

 I have, however, resolved to retain my description, as it is 

 much the fuller of the two, while Scottish students will be 

 enabled to recognise the moss. 



At this stage I am brought once more face to face with 

 a difficulty which formerly perplexed me, viz. what is the 

 genuine Grimmia Doniana ? This moss is fairly common in 

 Scotland, especially in the western half. The areolation of 

 the base of the leaf, in specimens that have come under my 

 observation, although in only one of the Continental or 

 Norwegian specimens, is very singular, almost unique amongst 

 the Grimmias. The cells of the lowest fifth or even fourth of 

 the leaves are very large, long, and colourless, as well as 

 diaphanous, and in size and appearance have a striking 

 resemblance to those of Barbnla tortuosa in the same relative 

 situation. They are oblong, almost cylindrical, 50 to 90 by 

 9 to 12 /i, becoming, towards the margin, even longer and 

 narrower, and often having a single or, occasionally, two 

 marginal rows advancing farther up than the rest ; upwards 

 these cells merge gradually and tranversely into the dense, 

 dark areolation of the rest of the leaf. All this holds true 

 for the majority of the specimens, but I have others from 

 several localities, notably from Rannoch and Broadford in 

 Skyc, in which the basal areolation is quite different. Strange 

 to say, I have a small specimen from Mr. Gardner, author of 

 a " Flora of Forfarshire," who is said to have got the moss 

 from Don himself or, at least, from his more immediate 



