28 THE DETERMINATIOlSr OF LICHENS IN THE FIELD 



(d) The rare plants Lecanora fugiens^ Bacidia carneoalhens, 

 and Buellia mxorum also have yellowish thalli, becoming reddish 

 with C and yellow with K. 



(e) The very rare plant Lecidea callicarpa also has a yellowish 

 th. K-, C at length reddish. 



{f) Lecanora sidfliurea and L. polytropa are common plants, 

 but are scarcely determinable without ap. 



(y) Glicenotlieca chrysocepliala is more granulate and is com- 

 j^aratively rare. 



(Ji) Mostly rare plants. Lejpraria flava is a name which has 

 been given to a j^ellow sterile th. 



(?) The rare plants JLecano^^a geminipara, Pertiisaria hryontha, 

 and Lecidia arctica are usu. papillose or sorediate, and therefore have 

 already been given in the key. 



{j) The reddish coloration is faint with C alone, but is definite 

 when the th. is treated previousl}^ with K. 



Additional Notes. 



Insert in (^) on p. 7. — In some cases the names given in the 

 Monograph are used, for convenience of reference, though other views 

 as to nomenclature may be held. 



Insert in (?/) on p. 8. — Soralia are present in Tormelia mougeotii., 

 P. amhigiia, P. duhia, and P. reddenda. In Bhyscia grisea the 

 margin of the thallus is sorediate. 



Insert in (r/) on p. 15. — The ascus usu. contains 8 spores, but 

 16 may be present in C. cerinellum. The spores ma^^ be +polarilocular 

 in Candelariella vitellina, the ascus of which usu. contains 16 or 

 more sjDores. 



Some Lecanoras — e. g., L. gangaleoides, L. friisfulosa, L. argo- 

 2^1iolis — may have a similar subsquamulose appearance to Flacolecania 

 (see 60, p. 7), but the spores are simple. The three examples given 

 have a yellow coloration with K. 



Owing to the high cost of printing, the publication of this 

 Key has been delayed for over two years. 



