ON TWO NEW BRITISH SPECIES OF COLLEIIACEI. 191 



In " Grevillea" i., p. 170, this species was erroneoiisly referred 

 by me to P. fuscatula, which the thallus somewhat resembles. A 

 better developed and fertile specimen, however, which, in conse- 

 quence of having been accidentally put away with some mosses in 

 a box, had till recently been overlooked, shows that the two plants 

 are quite distinct. The present species, as observed by Nylander, 

 I.e., has its neai'est ally in P, Tasmanica. 



2. Collema granulifexum. Nyl. — Thallus somewhat similar to 

 that of C. melcenum^ but firmer, and partly sprinkled with isidiose 

 globules, which are often crowded, the laciniaj, in dry state on the 

 under surface, often longitudinally and crowdedly, tbinly ruguloso- 

 plicated ; apothecia moderate, reddish, the tballine margin at 

 length subcrenated ; spores 3-septate, sometimes with 1-2 connect- 

 ing septules, -0,025-32 m.m. long, -0,008-12 m.m. thick. 



On old walls and rocks (calcareous), rarely amongst mosses on 

 the ground. Probably not uncommon in mountainous districts, as 

 at Appin (Crombie), Cheddar Cliffs (Joshua), Leigh Woods and 

 Kingsbridge (Holmes), Killarney (Hardy), but very sparingly 

 fertile. 



A larger and a smaller condition occurs, to the former of which 

 is to be referred C . flaccidum var. microlobum^ Nyl., olim in Cromb., 

 " Enum.," p. 5. In the latter state the thallus is frequently met 

 with, but poorly developed, and may readily by mistaken for C. 

 puljwsum f. gi-amdatum, Sw. This also is one of the Collemas to 

 which I referred in " Grevillea " ii.,p. 80, as sometimes protruding 

 itself through and obliterating the thallus of Solorina saccata Yar. 

 limbata — a matter of pure observation, which does not depend 

 upon any " stretch of imagination " whatever.* 



CRYPTOGAMIC LITERATURE. 



Magnus, P. Mykologische Mittheilungen, in " Hedwigia," 

 No. 2, 1875. 



NiESSL, G. V. liber Sphceria caidium, Fr., und Sphceria revelata, 

 B. & Br., in "Hedwigia," No. 2, 1875. 



Winter, G. Ein ueues Pyrenomyceten-genus (Hypocreojjsis). 



Reinsch, p. F. Contributiones ad Algologiam et Fungologiam. 

 Vol. i. Nuremburg. 



Smith, W. G. New and Rare Hymenomycetous Fungi, in 

 "Journ. Bot." April, 1875. 



* I may here notice that in my observations I.e., I by no means meant to 

 convey the idea that the thallus of var. limbata was simply these Collemeine 

 growths, but only that they sometimes usurped the place of its normally granulose 

 or isidiose thallus, which then appeared not contiuous, but merely borderiug the 

 apothecia. 



