24-2 PUCCINIA 



Teleutospores. Sun generally hypophyllous, scattered or 

 arranged in lines, oblong or linear and confluent into long striae, 

 pulvinate, compact, black; spores clavate, usually rounded above 

 and much thickened ( o 10/z), constricted, tapering downwards, 

 smooth, brown, darker at the apex, 35 — 66 x 14 — ~l'-\ /x: pedicels 

 yellowish, persistent, about half as long as the spore or less. 



.lv-idia on Urtica dioica, April June; uredo- and teleuto- 

 spores on Carex acutiformis (paludosa), G. hirta, G. pendula, 

 C. Pseudocypeiws, G. riparia, dune or July— April. Very 

 common. (Fig. 186.) 



It is recorded also, in other countries, upon a Long series of other 

 Carices (over forty-three), including C. m-nfn, ('. Gooden>>r',i. C. stricta, ami 

 ('. resicaria among British species. It must not be assumed, however, 

 without trial that these are all identical ; the forms on C. hirta, ' '. v< siearia 

 seem to be biologically distinct (Klebahn, Fischer), and others may belong 

 to /'. Pri)igsheimiana, etc. C. binervis is included by Plow-right, hut tin- 

 fungus on this host has not yet been experimentally shown to belong 

 to jE. Urticae. 



This parasite has been the subject of numerous investigations, since 

 Magnus in 1872 first showed that the recidium on the Nettle belonged 

 to the life-cycle of P. Caricis on Carex hirta. Plowright, Se-hroter, 

 Klebahn, and many others have followed in his steps. It may !>•■ 

 remarked here that few species of Puecinia on Carex can he determined 

 with certainty until the secidium-stage belonging thereto is known. 



The teleutospores of this species germinate after the winter's rest : 

 they succeed most easily during April. They may be found on new or old 

 leaves of Carex all the year round. It is almost in vain to look for 

 the secidium on the Nettle except in the vicinity of water where Sedges are 

 growing ; but where such a conjunction occurs, the parasite may often be 

 found upon both hosts in abundance every year. Klebahn records the 

 secidium on Urtica wrens ; Magnus states that the fungus can winter on 

 C. hirta by means of its uredospores. 



Distribution : Europe, Siberia, Japan, America, Australia. 



109. Puecinia Pringsheimiana Kleb. 



JEcidivra Orossulariae DC. Flor. fr. vi. 92. Cooke, Handb. p. 541 ; 



Micr. Fung. p. 197. Plowr. Ured. p. 263. 

 Puecinia Pringsheimiana Kleb. in Zeitschr. f. Pflanzenkr. v. 76. 



Soppitt in Card. Chron. 1898, xxiv. 145, f. 38. Sydow, Monogr. 



i. 652. Fischer, Ured. Schweiz, p. 268. Massee, Diseases of 



cultivated PI. p. 300, f. 88. 



