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Page number:210 
Remarks (internal):The identity of R. circumfusa and R. rubella has been discussed by Braun (1992a). The present species is very rare on Polygonum A collection on Persicaria hydropiper has been examined (Poland, Bialowieza, 19-9-1987, Mulenko, LBLM).
Meinicke (1987) and Huber-Meincke et al. (1989) used the present fungus as a potential mycoherbicide against Rumex weed.
Description type:Non-original description 
Description:Ramularia rubella (Bonord.) Nannf., in Lundell & Nannf., Fungi exs. suec., Fasc. XXXIX-XL, Sched.: 33 (1950) Fig. 482
Syn.: º Crocysporium rubellum Bonord., Bot. Z. 19: 201 (1861). º Ovularia rubella (Bonord.) Sacc., Syll. Fung. IV: 145 (1886).
= Oidium monosporium Westend., Bull. Soc. roy. Bot. Belg. 2: 252 (1863) [holotype: on Rumex crispus L., Belgium, Tervuren, Westendorp (BR)]. º Torula monosporia (Westend.) J. J. Kickx, Fl. Crypt. Fland. II: 301 (1867). º Ovularia monosporia (Westend.) Pound & Clem., Minn. bot. Stud. 1 (Bull. 9): 653 (1896). º O. monosporia (Westend.) Sacc., Syll. Fung. XXII: 1296 (1913).
= Peronospora obliqua Cooke, Rust, smut, mildew & mould, Ed. 1: 160, London 1865 [holotype: on Rumex sp., England, Highgate, July 1864, Cooke (K)]. º Ramularia obliqua (Cooke) Oudem., Nederl. kruidk. Arch. 2, Ser. I: 262 (1872). º Ovularia obliqua (Cooke) Oudem., Hedwigia 22: 85 (1883).
= Ramularia obovata Fuckel, Fungi rhen., Suppl., Fasc. II, No. 1635 (1866) and Jahrb. Nass. Ver. Naturk. 23-24: 103 "1869" (1870) [lectotype: on Rumex crispus L., Germany, Erbach, Fuckel, F. rhen. 1635 (HAL); isolectotypes: Fuckel, F. rhen. 1635]. º Ovularia obovata (Fuckel) Sacc., Fungi ital. del., Tab. 972 (1881).
= Ramularia circumfusa Ellis & Everh., Proc. Acad. Nat. Sci. Phil. 1895: 437 (1895) [holotype: on Rumex obtusifolius L., USA, Ohio, Oberlin, 1894, Kelsey (NY)].
= Ovularia obliqua var. canaegricola Henn., Notizbl. königl. bot. Garten 1: 238 (1897) [holotype: on Rumex hymenosepalus Torr., Germany, Berlin, botanical garden, Aug. 1896, Hennings (B)]. º Ovularia canaegricola Henn., in Saccardo, Syll. Fung. XIV: 1055 (1899).
= Ovularia monosporia Keissl., in Zahlbr., Ann. k. k. naturhist. Hofmus. Wien 29: 462 (1916), homonym and nom. superfl.!
Lit.: Saccardo (1886: 145; 1899: 1055, 1063; 1913: 1296; 1931: 700), Schröter (1897: 483), Lindau (1907: 237-238, 442), Ferraris (1910: 703, 915), Gonzáles Fragoso (1927: 23), Vasil'evskij & Karakulin (1937: 35), Moro_kovs'kij et al. (1971: 38), Švarcman et al. (1973: 70), Osipjan (1975: 199), Kranz (1977), Brandenburger (1985: 91), Ellis & Ellis (1985: 416), Sagdullaeva et al. (1989: 42), Braun (1992a: 464).
Ill.: Fuckel (1870: Pl. I, Fig. 16), Saccardo, Fungi ital. del., Tab. 972 (1881), Viégas (1944: 430, Pl. XXV), Kuhnholtz-Lordat (1948: 124, Fig. 4), Gunnerbeck (1967: Pl. 1, Fig. 2-3), Osipjan (1975: Fig. 6), Ellis & Ellis (1985: Pl. 159, Fig. 1651), CMI Descr. 851 (1986), Diaz et al. (1987: 101, Fig. A, B), Braun (1992a: 465, Fig. 11).
Exs.: Allesch. & Schn., F. bavar. 291. Barth., F. Columb. 3182, 3678. Cav., F. Longobard. exs. 197. Cooke, F. brit. 174. F. exs. suec. 1992. F. Ross. exs. 348. Fuckel, F. rhen. 1635. Kab. & Bub., F. imp. exs. 86, 235, 384, 784. Krieger, F. sax. 44, 1792. Krypt. exs. 1184, 2231. Migula, Crypt. Germ. Austr. Helv. exs. 292. Mycoth. fenn. 486, 867. Petr., Mycoth. gen. 1783. Plantae Graecenses, Fungi 197. Plantae Uruguayenses Exs. 856. Rabenh., F. eur. 2885. Reliquiae Farlowianae, Fungi 186. Roum., F. sel. exs. 5186. Sacc., Mycoth. ital. 384. Sacc., Mycoth. ven. 590. Syd., Mycoth. march. 493, 1275, 1276, 1588, 2788, 4793. Thüm., F. austr. 284, 545. Vestergr., Micromyc. rar. sel. 143. Vill, F. bavar. 872.
Leaf spots amphigenous, subcircular to somewhat angular-irregular, 1-20 mm diam., at first pale greenish, yellowish-ochraceous, later brownish, finally often greyish brown to dull grey, margin indefinite or narrow to broad, sometimes diffuse, brown, reddish brown to purplish violet, sometimes with a narrow to wide, yellowish, diffuse halo, occasionally somewhat zonate. Caespituli amphigenous, punctiform to subeffuse, greyish white, sometimes dense. Mycelium internal; hyphae hyaline, septate, sparsely branched; stromata absent or with small, loose hyphal aggregations in the substomatal cavities. Conidiophores in small to moderately rich fascicles, arising from internal hyphae or hyphal aggregations, emerging through stomata, erect, long, filiform, subcylindric, flexuous, geniculate-sinuous, simple, occasionally branched, 40-150 x 2-6 ?m, continuous or usually septate, hyaline, smooth; conidial scars somewhat thickened and darkened. Conidia solitary, obovoid, (10-)15-35 x 6-12 ?m, aseptate, very rarely with a single median septum, hyaline, smooth or almost so, apex rounded, base often somewhat attenuated; hilum somewhat thickened and darkened.
Typus: on Rumex aquaticus L., Germany, Guestphalia, Bonorden (not seen!).
Host range and distribution: on Polygonum, Rumex (Polygonaceae), almost circumglobal - Persicaria hydropiper (L.) Spach [Polygonum hydropiper] (Europe, PL), Rumex acetosa L. (Asia, China, Far East of RUS, Kazakhstan; Europe, A, D, F, GB, RO; Faeröes; South America, cf. Viégas, 1961), R. acetosella L. (Europe, I, PL; N. America, USA, ID, OR, WA), R. alpinus L. (Caucasus, Armenia, Kabardino-Balkaria; Europe, A, BG, CH, D, I, F, I, PL, RO, YU), R. amurensis F. Schmidt & Maxim. (Asia, Far East of RUS), R. aquaticus L. (Asia, Far East of RUS, Kazakhstan; Europe, A, D, S, SF), R. aquaticus x hydrolapathum (Europe, DK, S), R. altissimus A. Wood (N. America, USA, TX), R. chalepensis Mill. (Central Asia, Tadzhikistan), R. chilensis auct. (S. America, Chile), R. confertus Willd. (Central Asia, Kazakhstan; Europe, RUS, Ukr.), R. confertus x obtusifolius (Europe, D, LV), R. confusus Sim. (Europe, RO), R. conglomeratus L. (Europe, D, E, GB, I, PL; New Zealand, Chatham Is.), R. crispus L. (Asia, W. Siberia, Kazakhstan, Iran; Caucasus, Armenia; Europe, A, B, BG, CH, CZ, D, DK, E, EW, F, GB, H, I, PL, RO, RUS, Ukr.; Faeröes; N. America, Canada, Que., USA, MA, MN, NC, NY, UT; S. America, Brazil, Chile, Uruguay; New Zealand), R. daiwoo Makino (Asia, Japan), R. dentatus L. (Asia, China), R. hastatus Boldw. (N. America, USA, OK), R. halacsyi Rech. (Central Asia, Turkmenistan), R. hydrolapathum Huds. (Caucasus; Europe, D, DK, EW, PL, RUS), R. hymenosepalus Torr. (Cyprus; Europe, CZ, D, botanical garden; N. America, USA, AZ, NM), R. longifolius DC. (Asia, S. Korea; Europe, DK, EW, LV, N, RUS, S, SF; Faeröes; Iceland), R. maritimus L. (Europe, D, DK, LV, RO, RUS, YU; N. America, USA, WA; S. America, cf. Viégas, 1961), R. nepalensis Spreng. (Asia, China), R. obtusifolius L. (Asia, W. Siberia; Caucasus, Armenia; Europe, A, CH, CZ, D, DK, E, EW, F, GB, Hebrides, H, I, NL, P, PL, RO, RUS, YU, Ukr.; Faeröes; N. America, USA, OH; New Zealand), R. palustris Sm. (Europe, RO), R. patientia L. (Europe, A, D, H, LV; N. America, USA, KS; S. America, cf. Viégas, 1961), R. paulsenianus Rech. f. (Central Asia, Tadzhikistan, Uzbekistan), R. pulcher L. (Europe, E, F, I, P, RO; N. Africa, Morocco; Canary Is.; S. America, cf. Viégas, 1961), R. salicifolius Weinm. (N. America, USA, CA, ID, WA), R. sanguineus L. (Europe, D, DK, I, PL, RO), R. scutatus L. (Europe, D, F), R. stenophyllus Ledeb. (Central Asia, Kazakhstan; Europe, LV, RO), R. tianschanicus A. Los. (Central Asia, Kazakhstan), R. turcestanicus Paulsen (Europe, D, botanical garden), R. venosus Pursh (N. America, USA, OK, WA), R. spp. (Asia, Iraq, India, Japan, Turkey; Caucasus, Georgia; Europe, B, E, IRL, TR; N. Africa, Libya; C. America, Mexico; S. America, Brazil; Australia).
Taxon name: