thecopsora 371 



3. Thecopsora Vacciniorum Karst. 



Uredo Vacciniorum Link, Sp. PI. ii. 15. Cooke, Handb. p. 527; 



.Micr. Fung. p. 21<!. 

 Melampsora Vacciniorum Schrcit. ; Plowr. Ured. p. 24<;. 

 Pucciniastrum Vacciniorum Dietel, in Eng. u. Prantl, Natiirl. Pflanz. 



i. 1** 47. Fischer, IT red. iSehweiz, p. 4(i7, f. 305. 

 /'. Myrtilli Arthur, North Amer. Fl. vii. L09. 

 Thecopsora Vacciniorum Karst. Bidr. Finl. Nat. xxxi. 59. Sacc. Syll. 



vii. 7»;:>. 



Uredospores. Sori hypophyllous, rather small, scattered or 

 in groups on (sometimes orange) dis- 

 coloured spots which are visible for 

 some time before the sori appear, long 

 covered by the epidermis, brownish, 

 surrounded by a peridium which opens Fiur. '277. Th. Vaccini- 



,i -,i arum. Uredosi)ores on 



at the summit with a pore; spores v Myrtillm (Scotland). 

 ovate to ellipsoid, sparsely echinulate- 



vcrrucose,. orange-yellow, 15 — 16x12 — 13 fi, (21 — 28x14 — 

 18 fi, Fischer). 



[Teleutospores. Hypophyllous, developed in the epidermal 

 cells which are filled by them and form little brown inclehiscent 

 crusts, pale-brown, divided by longitudinal walls, 14 — 17 x 

 7 — 10 /x; epispore uniformly thin.] 



On leaves of Vaccinium Myrtillus, V. Vitis-idaea. Uredo- 

 spores only, May — October, Shropshire, Yorkshire, North Wales, 

 Scotland. * (Fig. 277.) 



The teleutospores are very rare, and can be found only on the dead or 

 fallen leaves. Fischer suggests that this may be a hetenucious species as 

 indeed is most likely the case, though no probable suggestion has yet been 

 mi de as to the nature of the alternate host. He records it on V. uligino- 

 xti tH also ; and Arthur on several other species of Vacciniaceae, in the 

 United States. 



Distribution : Europe, North America. 



24- 



