THE LARCH CANKER 77 



but since no spore measurements were given, it is impossible 

 to decide which species he was describing. 



5. Fries (1822), p. 91 (and 1828) described three forms of 

 Peziza calycina,, viz. : 



a. Pini sylvestris = P. calyciformis of Willd., Batsch, 



and Hedwig. 

 )3. Abietis. 

 y. Laricis ' albido-testacea '. 'In ramis pini Laricis, 



Chaillet. P. balsameae. Weinmann. (v.s.) ' 



It is a convention among mycologists 1 to accept Fries's 

 names for Ascomycetes where these are sufficiently dis- 

 tinctive ; but where a species is omitted, or insufficiently 

 described by Fries, to take the name given by the first 

 investigator after him who gave a description on which 

 a species can be based. What may be called the Continental 

 contention is that y Laricis is the equivalent of the canker- 

 producing fungus, and, if this is going to be raised to specific 

 rank, a new name [P. (DasyscypJm) W illkommii, Hart.] must 

 be adopted for it, since ' P. calycina ' is retained for a Pini 



It must be objected, however, that since each of the 

 species of Dasyscyplm under consideration grows on a variety 

 of trees, and since D. calycina, D. subtilissima, and D. 

 resinaria, as described on p. 76, can each grow on the 

 larch, it is very doubtful to which of these species y Laricis 

 of Fries belongs, and it is also doubtful which form he 

 intended by a Pini sylvestris. Certainly ' albido-testacea ' 

 is not peculiarly applicable to the canker-producing fungus. 



Fries introduced ' Dasyscyphae ' (bans, hairy ; oos, 

 a cup) as tribe vi of series ii (Lachnea) of the large genus 

 Peziza. 



Passing over Corda (1837), v. 78, and Hornemann (1839), 

 plate 1917, 1, whose species given under the name of Peziza 

 calycina are both doubtful, we come to 



6. Fuckel (1869), who is the first to give spore measure- 

 ments . Raising Fries's name Dasyscyphae to generic rank, he 



1 International Rules of Botanical Nomenclature, Brussels, art. 19, f. 



