360 MELAMPSORELLA 



biologically distinct. The secidium stage of this parasite is very rare 

 everywhere, and seems not to be recorded in Britain, except by Plowright 

 at King's Lynn; the other are exceedingly common all over the 



country, but do little damage. The teleutospores germinate after a 

 winter's rest, but since it is supposed they cannot infed the Birch and 

 the s^cidium-stage appears to 1"' so rare, it is doubtful by what means the 

 fungus propagates itself from yen- to year. Liro states that in Northern 

 Europe the secidium <>n the Larch does not occur, though the fungus is 

 very common in the uredo-stage, especially on Birch seedlings; but as he 

 also says that the uredospores d<> not survive the winter there, the question 

 of its perennation is left in a very unsatisfactory state. 



On the Hornbeam (Carpinw Betidus) there is in Europe an allied 

 species Melampsoridium Carpini to which an secidium has not yet been 

 discovered. 



Distribution : Europe, Asia, North America. 



MELAMPSORELLA Schroter. 



Heteroecious. 



Teleutospores in the epidermal cells, with a thin, colourless 

 membrane, usually one -celled, germinating at once on maturity. 

 Uredo-sori furnished with a peridium, and without any para- 

 physes amidst the spores ; uredospores yellow, sessile, produced 

 in short chains or singly, without evident germ-pores. /Ecidia 

 with a peridium. Uredo-sori and gecidia subepidermal : sper- 

 mogones subcuticular, without ostiolar filaments. 



This genus bears a certain resemblance to Milesian but is 

 distinguished from it by the absence of vertical septa in the 

 teleutospores, as well as by its habitat on Phanerogams. 



1. Melampsorella Caryophyllacearum Schrot. 



Mcidiwm elaiinum A. et S. Consp. p. 121. Plowr. Ured. p. 270. 

 Peridermium elatinum Link; Cooke, Handb. p. 535; Micr. Fungi 



p. 194! 

 Credo Caryophyllacearum Johnst. ; Cooke, Handb. p. ">26 ; Micr. 



Fung. p. 216. 

 Melampsorella Garyophyllacearwm Schrot. in Hedwig. 1874, xiii. 85. 



Klebahn, Wirtswechs. Rostp. p. 396. Fischer, Ured. Schweiz, 



p. 516, f. 522—6. 



