LICHENS OF SOWERBY'S HERBARIUM. 150 



Sowerby, and the fragment attached to the original drawing. True 

 P. e?icausta } Sm. Linn. Trans., i. p. 83, t. 4,/. 0, is a very rare 

 species in Britain, and seems to have been gathered only on one or 

 two of the higher Grampians in Braemar. 



5. Parmelia ambigua. E. B. S. t., 279G = P. ambicjua, Ach. Nyl. 

 and P. aleurites, Ach., Nyl. The former is represented by the two 

 lower figs., and the latter by the two upper; the British specimens 

 of both, which are found in herb. Sowerby, being barren, as in figs. 

 For the correct synonomy of these two species, vid. Nyl. Animad. 

 circa F. Arnold, in Flora, 1872, which is so far confirmed by spe- 

 cimens in Herb. Linn. Soc. Lond. 



6. Lichen ciliaris. E. B. t., 1352. = Physcia ciliaris (Linn.), and 

 /. actinota, Ach. The specimen drawn, from Bedfordshire (Abbot), 



has, as is usually the case in Britain, some of the apothecia with 

 the margin smooth, and others with it proliferous. Hence, as the 

 margin thus varies in one and the same specimen, a separate name 

 is not necessary for the so-called form. 



7. Lichen pulvexulentus. E. B. t., 2063. = Physcia pulverulenta, 

 var. laciniolata, mihi. Although the fig. has been referred to var. 

 venusta, Ach., which has the apothecia crowned with short hori- 

 zontal laciniag, yet, as these are also scattered over the thallus in 

 the specimen drawn, as shown in the middle fig., this evidently 

 represents a better developed condition than venusta, and may be 

 named as above. 



8. Lichen stellaris. E. B. t. } 1G97. = Physcia stellaris (?). The 

 fig. by mistake was coloured green, vid. E. B. sub Ph. pulverulenta. 

 Tin' specimen drawn, which unfortunately does not occur in herb. 

 Sowerby, may, judging from the fig., belong rather to Ph. aipolia, 

 and represent an intermediate state between the type and var. 

 anthelina (Ach). 



9. Faxmelia erosa. E. B. S. t., 2807. = Physcia erosa (Borr.), 

 Leight. The specimen in herb. Sowerby, from Hurstpierpoint, 

 Sussex, is evidently that drawn in E. B., and was rightly separated 

 by Borrer from Ph. stellaris var. tribacia, Ach., with which it has 

 frequently been confounded. 



10. Lichens vixellus. E. B. t., 169G. == Physcia obscura vars. 

 virella (Ach.), andulothrix (Ach.) Of these the former is repre- 

 sented in the two upper figs., and the latter in the lower fig. The 

 supposed peculiar character of ulothrix, however, is found in oilier 

 vars. of Ph. obscura, so that it can scarcely be considered distinct. 

 Lichen cycloselis E. B. t., 1942, is Ph. obscura (Ehrb.), sufficiently 

 typical. 



11. Lichen elaeinus. E. B. t., 2158. = Physcia adylutinata (Flk.) 

 The specimen, drawn from the bark of trees, Sussex, shows that 

 this is not Pannaria elaina (Whlnb.), which does not occur in 

 Britain, but Physcia adglutinata, as observed by Borrer, E. B. S. 

 t., 279G, descript. 



