262 NOTES ON LICHENS 



CoUema cretaceum = Leptogium cretaceum, Sm. 



tremelloides = Lept. tremelloides, (L.) 



Leptogium tenuissimum, Dicks. "Yarmouth, Dickson, 



ex herb." Turner, no date, but probably collected at 

 the beginning of the last century. An interesting link 

 with the earliest days of lichen research. 

 Collema eeranoides, Borr. 



meloenum, Ach. 



nigrescens, Huds. 



microphyllum, Ach. 



Trachylia tympanella, Fr. 

 Calicium curtum, Barr. 

 Sphasrophoron fragile, Pers. 

 Boeomyces icmadophilus, Ehrh. 

 Cladonia squamosa, Hflfm. 



var. microphylla. 



var. decorticata. 



pyxidata var. fimbriata, Hffm. 

 gracilis, Hffm. 

 cervicornis, Schoer. 



Alectoria implexa, Nyl. 

 Eamalina pollinaria, Ach. 



" polymorpha." There are several specimens so 



named, all of which I refer to E. cuspidata, Nyl. 



Cetraria aculeata, Fr. 

 Platysma gluucum var. fallax, Web. 

 Peltigera horizontalis, (L.) 

 Parmelia Mougeotii, Schoer. 



scortea, Ach, 



incurva, Pers. 



Physcia astroidea, Lem. 



adglutinata, Flk. 



obscura, Ehrh. 



stellaris, Nyl. This seems to be the true plant, and 



not P. aipolia, Nyl, which has generally been confounded 

 with it. 



Psoroma hypnorum, (Vahl.) A species easily recognised by 



the subcrenulate margin of spores. 

 Pannaria nigra, (L). 

 Squamaria coesia = Physcia ccBsia, Nyl. 



