26 



JOURNAL OF MYCOLOGY. 



occurs on Bumex and Rheum, while Cornu produced an secidium on 

 Ranunculus repens as the result of infection with its teleutospores ; so 

 that a strict application of the logic of heteroecism must necessitate 

 the recognition of two species in place of one. Another curious thing 

 about the reed-rusts is, that Puccinia magnusiana, a species morpholog- 

 ically different from the last, also produces cluster-cups on Rumex and 

 Rheum, which cannot be readily separated from those of P. phragmitis, 

 when taken by themselves. 



Caeoma, a genus usually placed with the isolated uredo and secidial 

 forms, is said by Rostrup to be, at least in part, the secidial stage of 

 Melampsora, which has heretofore been supposed to have no aecidium, if 

 we except the sub-genus Calyptospora. C. euonymi, C. ribesii, and C. 

 mercurialis are respectively connected with M. caprearum, M. hartigii 

 (in part), and M. tremulse, as the result of experiments ; while a species 

 similar to, if not identical with, the last named, is said to cause the 

 development of Caeoma pinitorquum w^hen spwn on pines— a fact which, 

 if true, renders intelligible the greater abundance of the Caeoma in the 

 vicinity of aspens, as observed in Jutland. 



As now understood, the truly heteroecismal species are brought 

 together in the following list : 



TELEUTOSPOmC FORMS. ^CIDIA. 



Chrysomyxa ledi, (A. & S.) ><Ecidium abietinum, A. & S. 



" rhododendri 



Coleosporium senecionis (P.) Peridermium pini (Willd.) 



Gymnosporangium clavariseforme ( Roestelia lacerata (Sow.) 



(Jacq.) \ " penicillata (Sow.) 



Gymnosporangium juniperinum (L.) " cornuta, Gmel. 



sabinae (Dicke.).. cancellata, Rebent. 



Melampsora caprearum, DC Caeoma euonymi. 



goeppertiana (Kuehn.) . . ^cidium columnare, A. & S. 

 hartigii, Thuem Caeoma ribesii. Lk. 



tremnlfp Tnl i " pinitorquum, A. Br. ? 



tiemulae, lul | mercurialis. 



Puccinia arundinacea, DO jEcidium ranunculacearum, auct. 



" caricis, (Schum.) urticae, Sebum. 



coronata, Cda rhamni, Gmel. 



" dioicae, Magn " jacobaeae, Grev. 



" eriophori, Thuem " cinerariae, Rostr. 



graminis, P " berberidis, Gmel. 



limosae, Magn Caeoma lysimachiae, Schl. 



" magnusiana, Koern ^cidium rubellum, Gmel. 



moliniae, Tul " orchidearum, Desm. 



" phragmitis, Schum " rubellum, Gmel. 



" poarum, Mels " tussilaginis, Gmel. 



" rubigo vera (DC.) asperifolii, P. 



" sesleriae, Reich " rhamni, Gmel. 



sessilis, schn alii ursini, P. 



" silvatica, Schr " taraxaci, Schm. & Kze. 



Uromyces dactylidis, Otth " ranunculacearum, auct. 



junci (Desm.) " zonale, Duby. 



pisi (Pers.) " euphorbiae, Gmel. 



" poae, Rabh " ficariae, P. 



