THECOPSORA 371 
3. Thecopsora Vacciniorum Karst. 
Uredo Vacciniorum Link, Sp. Pl. ii. 15. Wonks, Handb. p. 527; 
Micr. Fung. p. 216. 
Melampsora Vacciniorum Schrét.; Plowr. Ured. p. 246. 
Puceiniastrum Vacciniorum Dietal, in Eng. u. Prantl], Nattirl. Pflanz. 
i. 1**, 47. Fischer, Ured. Schweiz, p. 467, f. 305. 
P. Myrtillé Arthur, North Amer. Fl. vii. 109. 
Thecopsora Vaceiniorum Karst. Bidr. Finl. Nat. xxxi. 59. Sac. Syll. 
vii. 765. 
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 Fiz. 277. Th. Vaccini- 
at the summit with a pore; spores T Myrtilles (Rontkma) 
ovate to ellipsoid, sparsely echinulate- 
verrucose, orange-yellow, 15—16 x 12—18p, (21—-28 x 14— 
18 », Fischer). 
[Teleutospores. Hypophyllous, developed in the epidermal 
cells which are filled by them and form little brown indehiscent 
crusts, pale-brown, divided by longitudinal walls, 14—17 x 
7—10; epispore uniformly thin.] 
On leaves of Vaccinium Myrtillus, V. Vitis-cdaea. 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 hetercecious species as 
indeed is most likely the case, though no probable suggestion has yet been 
made as to the nature of the alternate host. He records it on V. uligino- 
sum also; and Arthur on several other species of Vacciniacesw, in the 
United States. 
DistRisuTIoN: Europe, North America. 
bo 
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