100 A. Barclay — A Descriptive List of the Uredinegs [No. 2, 



pnyses. The uredospores are spiny and yellowish brown, and fall off 

 without any portion of the stalk adhering, although the place of attach- 

 ment to the stalk is generally very noticeable (fig. 8, PL IV). The 

 walls are generally uniformly thick, but in some cases with a very 

 slight apical thickening. The fresh spores examined in water measure 

 on an average 35 x 26'2/u., varying from 82 x 27 to 40 X 24/*. Each 

 spore has two germ spores. When placed in water these spores germi- 

 nate at once most freely, forming immensely long germ tubes, so long 

 that if numerous spores are floated on water in a watch glass in 24 hours 

 a white silky mould appears to have been formed by them. In germi- 

 nation they are typical uredospores. I never found any teleutospores 

 though I looked carefully for them until the host withered in winter. 



6. Uredo Deutziae, nov. sp. 



On Deutzia corymbosa, Br. 



I found this host attacked with a Uredo-beaiung fungus in June. 

 The pustules are very pale yellow, hypophyllous, on paled circular areas 

 of the leaf. They are numerous on each leaf. Each pustule, of which 

 there are many on each discoloured patch, is minute and hemispherical. 

 The upper leaf surface is paled opposite the spores below. In general 

 appearance they resemble the Uredo pustules of Melampsora or Coleos- 

 porium. The spores are pale orange yellow, sparsely spiny, round to 

 oval, and measuring 25 — 22 x 21 — 18/x, after lying 24 hours in 

 water. 



Bemarhs. — I found fungus while this paper was passing through 

 the press and I have been unable therefore to illustrate it in the plates. 

 I have not had an opportunity for observing its further development, 

 and must class it meanwhile with isolated Uredo forms. It may 

 possibly be U. Hydrangeae, Berk, et Curtis. 



ADDENDA. 



In the first portion of this list of Uredines* containing a descrip- 

 tion of the Aecidial forms I noted that I would defer a description of 

 the two forms occurring on Pinus longifolia and P. excelsa, as my notes 

 of them were at that time incomplete. Descriptions of them now 

 follow. In addition to these I have noted the characters of other two 

 isolated Aecidia. 



Since the publication of the second part of this list,f dealing with 



* Journal of the Asiatic Society of Bengal, Vol. LVI, Pt. II, No. 3, 1887. 

 t Ibid, Vol. LVIII, Pt. II, No. 2, 1889. 



