Whitewoolly Rose

In Great Britain and/or Ireland:
Fungus / parasite
Podosphaera pannosa parasitises Rosa tomentosa

Rosa tomentosa Smith, Fl. Brit. 539. 1800
Stem terete, 1-2 m. high, often with elongate drooping branches, armed with straight or slightly curved, often paired prickles, somewhat flattened towards the base, 5-7 mm. long; stipules 1-1.5 cm. long, glabrous above, pubescent on the back, glandular-ciliate on the margins; petiole and rachis villous and glandular-hispid, sometimes prickly; leaflets 5-7, oval or ovate, 2-4 cm. long, rounded at the base, acute or short-acuminate at the apex, more or less doubly serrate, finely appressed-pubescent above, villous and glandular-pruinose beneath; flowers solitary or few together; pedicels often glandular-hispid; hypanthium globose or somewhat ellipsoid, often glandular-hispid at the base; sepals lanceolate, glandular on the margins and back, about 2 cm. long, acuminate, usually more or less lobed, tardily deciduous before the ripening of the fruit; petals 18-20 mm. long, pale rose-colored or nearly white.
Type locality: About London.
Distribution: Native of Europe; collected in North Carolina and at Big Sandy, Texas.

Rosa tomentosa, otherwise known as the harsh downy-rose, is a species of wild rose. It is a shrub growing to about 3 metres (10 ft). It is found in Asia Minor, the Caucasus (where it may not be native), and much of Europe: the British Isles, France, Central Europe, northern Spain, Italy, and the Balkans (except Greece). On the British Isles it can be found in hedgerows and woodland margins, and it typically flowers between June and July. Further south, in Bulgaria, it flowers in May.