Dr James Stirton on Lichens. 357 



explain the intrusion of any of the species on this coast of 

 Newfoundland. I have little hesitation in referring the 

 small and imperfect specimen in the collection to this 

 genus, as the general appearance, texture, and chemical 

 reactions are all in accordance with this decision. 



The Cladonicc of the rangiferina group are beautifully 

 represented in the collection, and 1 am beginning to 

 recognise at sight a third form in which the reactions of 

 the thallus are K — C — . Apart from these negative 

 reactions, there is a general, almost distinctive /ac/es, but 

 how to describe it in words I know not. I notice, how- 

 ever, that the axillae are more widely gaping than in CI. 

 rangiferina or st/lvatica, and the stems present a faint 

 yellowish appearance towards their summits, while their 

 surface is more fiocculent, or, as it were, farinose. I grant 

 that although it is possible when one has specimens before 

 him, so well developed as those from Newfoundland, to be 

 influenced by such characteristics, more especially when 

 these are constant, yet it may not be so easy to discri- 

 minate less marked states. Meanwhile, I have thought it 

 right to give expression to these views by constituting a 

 new sub-species, under the name Cladonia subsylvatica. 



The following is a list of the species and varieties, 

 amounting to 39: — 



Sphasrophoron coralloides, Pers. 

 Sphaerophoron divergens, subsq. nov. 



Simile Sp. coralloidi sed plerumque humilius et medulla K fla- 

 vente. 



This reaction is well marked, and has also been gut in 

 several specimens from various parts of Scotland, and 

 doubtless the same is true of plants from other localities. 

 The negative reaction is absolute in Sp. coralloides ; and 

 as there are no intermediate states, I am of opinion that 

 a specific place is due to the present plant. The blue 

 reaction by iodine on the medulla is common to both. 



Sphaerophoron fragile, Pers. 



Cladonia gracilis var. hybrida, Hoffm., v. Fr. Lich. Scand., p. 82. 



Cladonia crispata, Ach., and forma gracilior, Sfrn. 



Cladonia rangiferina, L., and var. scabrosa, Lnight. 



Cladonia sylvatica, L., and var. alpestris L. and Schccr. 



