134 



Turning to Linntens' flora of Sweden (Fl. suec , 1745, p. 368), where this 

 species is the first named under the genus Tremella, and to his flora of Lapland 

 Fl. lapp., 1737, p. 370), it will be found that these lines are the descriptive names 

 used in those works respectively, both works antedating the introduction of 

 binomial names. 



In Engler & Prantl's Nat. Pflanzenfamilien (Vol. 1, p. 92) Lindau has credited 

 the genus Tremella to Diilenius, as has also Saccardo in h.\B Sylloge Fungorum (Vol. 

 7, p. 780). Both these authors undoubtedly are following Fries in his classical 

 work, Systema Mycologicum, of 1823 (Vol. 2, p. 210). The reference is clearly to 

 Diilenius' Historia Muscorum of 1741, where we find seventeen species listed under 

 Tremella, but strangely enough not one of these is a fungus. The first species, 

 which we must consider the type, is characterized as " Tremella marina vulgaris, 

 Laciuca' similis, Oyster Green or Laver." This is certainly a marine alga. In 

 Linntt'us' Speciei^ Planfarum of 1753 (p 1163) we will find this species given, with 

 direct citation of Diilenius, under the name CJlia Lactuca, as the fifth of the nine 

 species under the genus Ulva. It is certainly evident that Linnaeus did not found 

 his genus Tremella upon that of Diilenius, and that the twenty or more species of 

 fungi now generally listed under Tremella as a Dillenian genus are not correctly 

 referred. 



It seems certain, if the method of types is accepted, that Tremella replaces 

 Gymnosporangium as a genus of Uredinew, and that the usage to which the name 

 has generally been applied by modern systematists is erroneous. The same 

 method of procedure shows eight generic synonyms of Treviella, which will be 

 given without further comment, together with their type species and their respec- 

 tive hosts. 



There are fifteen described species of cedar apples, of wliich eight occur ex- 

 clusively in North America, two in both North America and Europe, three wholly 

 in Europe, one in India and one in China and Jap.an. In order to show their 

 status in the genus Tremella, and also for convenient review, they are here listed. 



1753. TREMELLA Linnceus. 



( T. juniperina on Juniperus sp.) 



1763. Puccinia Adans. (P. non ramosa Mich, on Juniperus xp.). 



1791. ^cidiiim Pers. {^. cornutum on Sorbvs aucuparia). 



1804. Ru'delia Reb. [R. cancellata on Pyrus communis). 



18(.i5. Gymnosporangium Hedw. f. {G. conicum on Juniperina communis). 



1809. Podisnma Lk. (G. fuscum DC. on Juniperus sp.). 



