23 



Sticta hirta (Sp. Nova). — Notwithstanding the varied forms assumed 

 by Sticta Urvillei, I am tempted to elevate into the rank of a species one 

 of the several specimens sent. 



Thalhis widely expanded, reticulato-foveolate, broadly and ronndly 

 lobed, covered in many places vs^ith dense clusters of yellow isidiose 

 efflorescence, under surface dark brown, densely tomentose ; apothecia 

 reddish brown, merging into black, margin composed of a mass of radiat- 

 ing isidiose excrescence, which, in many instances, almost covers the 

 disk; spores as in the variety Colensoi. 



NOTE, 



Since the Keport was arranged, Dr. Stii-ton exhibited two lichens 

 from Ben Lawers, collected by him in June 1871, each somewhat 

 anomalous in the section to which it belongs. 



1st. Solorina hispora, Nyl. (Syn., p. 331). — The spores, in size and 

 shape, are characteristic, as well as the peculiar granular or isidiose 

 appearance of the thallus in the neighbourhood of the apothecia. This 

 lichen is more allied to S. limhata than to S. Saccata. This is the first 

 intimation of its existence in any other locality than that on the 

 Pyrenees. 



2nd. Lecidea didymospora (Sp. Nova). — Nearly allied to L. sanguinaria, 

 but difiering in having two spores in each ascus, which are, besides, only 

 half the size of those of the latter, and oval in shape instead of oblong. 

 A section of an apothecium shows, also, a perfectly pellucid appearance, 

 instead of the greenish tinge which pervades the hymenium of L. 

 sanguinaria, and the thallus is more continuovis. The chemical reactions 

 of the hymenium, epispore, and thallus, are identical in both. The dis- 

 coverer remarked, besides, that this lichen is as much entitled to a 

 specific place as Lecidea geminata. 



