Pticcinia Cyperaceae. ^ 



Carex. 

 57. Puccinia longispora McAlp. 



IT. Uredo-sori hypophyllous, minute, elliptic to elongated, confluent in 

 long lines, long covered by epidermis, rusty- brown. 



Uredospores sub-globose to shortly elliptic or obovate, yellowish- 

 brown, thick-walled, echinulate, with three equatorial <*erm-pores 

 on one face, 22-30 x 19-22 //, or 23-27 /z diam. 



III. Teleutosori black, compact, elongated, buliate, crowded, confluent 

 in long black lines, covered for some time, then girt by ruptured 

 epidermis. 



Teleutospores clear yellowish-brown to smoky-brown, elongated, 

 narrow, smooth, constricted at septum, 50-80 X 14-19 ^, average 

 63 X 19 fj. ; upper cell darker than lower, generally rounded and 

 slightly expanded at apex, sometimes bluntly pointed, much 

 thickened (9-12 p) ; lower cell longer than upper, almost cylin- 

 drical or slightly attenuated towards base ; pedicel yellow, short 



and often stout. 



* 



On Carex caespitosa L., and C. vulgar is Fr. 



Victoria Werribee Gorge, January, 1903. Gembrook Ranges, 

 April, 1904 (C. French, jun.) 



On Carex sp. 



Victoria Killara, March, 1903 (Robinson). 



In immature forms of teleutospore the upper and lower cells are much 

 alike, but ultimately the lower cell is much elongated and nearly equally 

 broad throughout. Although 33 different Puccinias are recorded on species 

 of Carex, the elongated narrow teleutospore with short pedicel is quite 

 characteristic for this species. In P. schoeleriana Plow, and Mag., the teleu- 

 tospores may be equally long, but the lower cell is more cuneiform than 

 cylindrical, and the pedicel may reach a length of 57 ^u. An examination of 

 teleutospores from Carex arenaria L. in Syd. Ured. Exs., No. 282, showed 

 these differences distinctly. 



Specimens of P. caricis (Schum.) Rebent. were examined from Exsicc. 

 Sydow Ured. No. 1065 and Exsicc. Briosi and Cavara, No. 12$, and the 

 teleutospores were decidedly different. 



The lower cell in P. longispora is much more elongated and narrower 

 and gradually merges intb the short, stout and coloured pedicel, while in 

 P. caricis besides being generally considerably shorter, more wedge-shaped 

 and somewhat inflated, the pedicel was much narrower. It is in the upper 

 cell, however, that the difference is most striking. In P. caricis the thick- 

 ened apex is one-half the length of the cell, while in P. longispora it is only 

 one-third, taking the average of a number. The thickened apex, also, in 

 P. caricis is much darker than in P. longispora. Of course, as in so many 

 other cases where there are a number of species on the same genus of host- 

 plant, there is a family resemblance too, between the rusts, and P. caricis 

 and P. longispora have many points in common along with differences in 

 detail. 



(Plate IV., Fig. 31.) 



