MTCOLOGTCAL XOTES 



135 



Puccinia longissima, S-povea X 500. 



surface by discoloured spots, oblong, about | mm. in length, siu*- 

 rounded by the split epidermis, deep orange-brown, somewhat like 



those of P. dispersa, at length 

 pulverulent; spores ovoid or 

 roundish, rather thin-walled, 

 but ])rovided with several 

 scattered thickened areas 

 (pores), about 25-30 n diam., 

 tinely echinulate, with orange 

 contents and a yellowish or 

 pale - brown coloured meui- 

 brane, often much like that 

 of P. dispersa ; jx^dicels long, 

 slender, broadened at top. 

 Teleuto-sori similar but nar- 

 rower, more often lanceolate, 

 surrounded and partly covered 

 by the cleft epidennis, at 

 length naked, but not pul- 

 verulent, deep chestnut - 

 brown ; spores elongate, oblong 

 or subclavate, yellowish-brown, 

 60-120 X 12-20 ^ ; upper cell 

 ellipsoid or cylindrical, thickened above (up to 10 /,<) where it is 

 rounded or attenuated to a blunt (sometimes oblique) point and 

 darker, i. e. chestnut-brown ; lower cell usually + cylindrical, mostlv 

 longer than the upper one (by as much as one-third), paler and 

 narrower, sometimes, especially when shorter, attenuatecl downwards, 

 and obovoid or pyriform, thin-walled; a constriction at the darker 

 septum or none ; pedicels short, pale-brownish. 



On Koeleria cristata, in two localities near Aberdeen, Sept. 20 

 1916 (Prof. Trail). 



There are often five bordered ^^ores visible on one face of a 

 uredo-spore, or as many as four round the margin. This is the 

 British Uredine which has hitherto been put doubtfully under 

 P. jyaliformis Fckl., but it is certainly not that species (which 

 after all may not be anything but P. Caricis). It may not be 

 identical in every respect with P. lom/issima, as described by 

 Bubak, which was on K. gracilis and had its a^cidia on Sedtun. 

 But it is at any rate very closely allied to that species as is shown^ 

 by the remarkable and unusvial length of the teleutospores, from 

 which it derives its name. I take this opportunity, which I owe 

 to the kindness of Mr. A. D. Cotton who communicated the spe- 

 cimens, of furnishing accurate figures from the new gatherin"-, made 

 while it was still fresh. Some of the sjDores were like those fio-ured 

 in my Ricst Fimr/i (fig. 217) ; these are not reproduced here, but 

 far more Avere like the figures now given. Professor Trail is to be 

 congratulated on his success in havhig cleared up so far the identity 

 of his previous find wdiich dated so long ago as 1883, 



Chrtsomyxa Rhododexdei De By. This Uredine was first 

 discovered in Britain by Mr. D, A. Bftyd, who found the uredo- 



