74 FUNGOID PESTS OF CULTIVATED PLANTS. 



No ^Ecidium or Uredo has been found associated with this disease. 



The teleutospores are somewhat elliptical, from golden-yellow to chest- 

 nut-brown (38-60 x 24-27 //), obscurely reticulated, either rounded at both 

 ends or with the base somewhat attenuated into the very short, thick, 

 deciduous peduncle, with a central partition dividing the teleutospore into 

 two nearly equal cells. 



Nuovo Giorn. Bot. Ital vii. 255 ; Sacc. Syll. vii. 2579. 



The attack of Fusarium bulbigenum on Narcissus bulbs (Grevillea, 

 xvi. 49) has not been repeated. 



A form of leaf-spot (Septoria Narcissi), with the receptacles scattered 

 over the tips of fading leaves, has not yet been observed out of Italy. 



IRIS BUST. 

 Uredo Iridis (Thiini.). 



This rust is believed to be common in gardens on the leaves of various 

 species of Iris and to be quite distinct from another Uredo which furnishes 

 the uredospores of Puccinia Iridis (DC.). This Uredo is supposed to have 

 neither ^cidium nor Puccinia associated with it. 



The pustules are linear-ovate, and sometimes confluent, on both sur- 

 faces of the leaves, covered at first by the cuticle and then exposed by 

 rupture, of a chestnut-brown colour. The uredospores are almost globose, 

 rarely somewhat pear-shaped, externally rough, brown (80-35 x 20-25 /u). 



Dr. M. Foster says " it does not readily attack the broad-leaved 

 Mediterranean forms, but I am inclined to think that almost every species 

 would take it." 



Sacc. Syll. xi. 1299 ; Ploivr. Brit. Ured. 257. 



There is supposed to be another species in North America (Uredo 

 iridicola) on the leaves of Iris versicolor, with rough globose uredospores 

 (25 fj. diam.), of which we know nothing, and it may be the Uredo Iridis 

 of Schweinitz. 



IRIS BRAND. 

 Puccinia Iridis (DC.), PI. V. fig. 91. 



It is difficult to follow the mutation of names, but this we believe to 

 be the same fungus which Berkeley called Puccinia truncata. It is found 

 on the leaves of many species of Iris, besides I. fatidissima and 

 I. germanica. 



The uredospores are found in crowded pustules, at first covered, then 

 exposed, of a rusty-brown colour, crowded together, and either sub- 

 globose, elliptical, or ovoid (20-35 x 16-26 p), externally rough, and 

 ochraceous. 



The teleutospores occur in linear, elongated, striaeform pustules, which 

 are blackish to the eye ; the spores are two-celled, club-shaped, with the 

 apex rounded, or rather obtuse, or acuminate, with the spore-coat thickened 

 at the apex, constricted in the middle at the septum (30-55 x 14-22 fi), 

 smooth, pale brown, with a hyaline pedicel (12 x 5 p). 



