Spermogonia and the so-called Spermaiia. 19 



far that they originate from promycelial infection of their 

 respective host-plants, and that their spores are produced 

 in hnear basipetal series. In fact, the Caeomata only differ 

 from the ^cidia in the want of a peridium. Yet we do 

 not find spermogonia exclusively associated with these 

 two spore-forms ; on the contrary, they occur not very 

 rarely with the uredospores — a spore-form which does not 

 present any morphologically biological parallel with the 

 two above named, inasmuch as its spores are produced 

 singly on separate and distinct spore-forming hyphse ; nor 

 has any sexuality ever yet been claimed for uredospores. 

 As instances in which spermogonia accompany uredospores 

 may be quoted TripJiragmiuin idniarice and the Brachy- 

 pucciniae, Piiccina Jderacii (Schum), P. siiaveolens (Pers.), 

 P. bidlata (Pers.), P. oreoselini (Strauss), and Uromyces 

 terebiiithi (D.C.). Nor is this all, for spermogonia also 

 occur with the teleutospores, as in P. sdpJdi (Schw.),* P. 

 falcari(s{V&rs.), P. lUiacearum (Duby), and P.fusca (Relh.).t 

 It has been suggested that the association of the spermogonia 

 with the teleutospores in the last-named species might be 

 only an exceptional case irt which the corresponding female 

 spore occurred upon some other plant — in other words, that 

 it is an heteroecious species ; but while admitting the full 

 weight of this argument in the abstract, yet of the Pucciniae 

 in question, if P. fusca be a Pucciniopsis, and have for 

 its gecidiospores ^.cidiuin leticospermimt, an aecidium so 

 markedly accompanied by spermogonia that their presence 

 was recognized by the older botanists, we must consider 

 it to be an exceptionally well-provided species. 



The escaped spermatia are very commonly found scat- 

 tered amongst the aecidiospores, and often adhering to their 

 outsides. Mr. W. G. Smith % has represented this condition, 



* Trelase, " Parasitic Fungi of Wisconsin." 1884. 



t Tulasne, "2^ Memoire," p. 116, note. 



X W. G. Smith, " Diseases of Field and Garden Crops," p. 166, fig. 86. 



