Search on : Taxa descriptions

 


   
Literature:
 
Page number:202 
Remarks (internal):There is a recent collection of a very similar hyphomycete on Cannabis sativa which is morphologically indistinguishable from R. collo-cygni (Austria, Graz, Geidorf, botanical garden, 2-10-1995, Ch. Scheuer, GZU).  
Description type:Non-original description 
Description:Ramularia collo-cygni B. Sutton & J. M. Waller, Trans. Br. mycol. Soc. 90(1): 57 (1988) Fig. 472
Syn.: º Ophiocladium hordei Cav., Z. Pflanzenkr. 3: 26 (1893). º Ovularia hordei (Cav.) R. Sprague, Mycologia 38: 63 (1946). º Ramularia hordeicola U. Braun, Internat. J. Mycol. Lichenol. 3(2/3): 281 (1988), non R. hordei McAlp., 1902.
= R. glyceriae Jaap, Fungi sel. exs. 843 (1922) and Verh. bot. Ver. Prov. Brandenb. 64: 58 (1922), nom. nud. (on Glyceria maxima (Hartm.) Holmb., Germany, Brandenburg, Triglitz, 1916, Jaap, F. sel. exs. 843).
Lit.: Saccardo (1895: 587), Lindau (1907: 16), Ferraris (1910: 698), Sprague (1950: 407), Brandenburger (1985: 787), Huss et al. (1987, 1992), Braun (1991a: 289), IMI Descr. 1039 (1991).
Ill.: Cavara (l.c.: Pl. 4, Fig. 9), Ferraris (1910: Fig. 178), Migula (1934: Pl. 91, Fig. 7), Sprague (1950: 408, Fig. 75), Huss et al. (1987: 167-169, Fig. 1-4; 1992: 90-91, Fig. 2-3), Sutton & Waller (l.c.: 56, Fig. 1), Braun (l.c.: 298, Pl. 2, Fig. 12), IMI Descr. 1039, Fig. (1991).
Exs.: Jaap, F. sel. exs. 843.
Leaf spots amphigenous, oblong-linear, lenticular, short, 1-3 x 0.3-0.5 mm, sometimes expanded, up to 30 x 1-2 mm, yellowish-ochraceous, pale to medium brown, margin indefinite, sometimes with a yellowish halo, finally often confluent, occasionally large leaf segments or almost entire leaves discoloured, necrotic. Caespituli amphigenous, mostly hypophyllous, punctiform, greyish white or with a pale pink tinge, arranged in lines between veins. Mycelium internal; hyphae hyaline, septate, sparsely branched, smooth, 1-5 ?m wide; stromata absent or small, 10-30 ?m wide, hyaline, subhyaline to pale brown. Conidiophores in small fascicles (2-15), loose, occasionally solitary, arising from internal hyphae or stromata, emerging through stomata, occasionally erumpent, erect, 15-70 x 3-5 ?m, simple, occasionally forked, lower part straight, subcylindric to sinuous, somewhat narrowed towards the tip, apex curved, uncinate to irregularly twisted (often curved back towards the main axis of the conidiophore, like a swan's neck or shepherd's crook), tips often slightly swollen, colourless, 0-3-septate, smooth; conidial scars conspicuous, somewhat thickened, darkened. Conidia solitary, obovoid, ellipsoid-subglobose, (5-)6-12(-15) x (4-)5-9 ?m, aseptate, hyaline, almost smooth to verruculose-echinulate, both ends more or less broadly rounded; hilum basal, usually somewhat eccentric, hardly or very slightly thickened, somewhat darkened.
Typus: on Hordeum vulgare L., Italy, Longobardia, Cavara (not seen!).
Host range and distribution: on various cereals and grasses (Poaceae) and Cannabis (Cannabaceae), Europe, N. and S. America - (1) Poaceae: Bromus inermis Leyss. (N. America, USA, AK), B. sp. (N. America, USA, AK), Festuca sp. (N. America, USA, UT), Glyceria elata (Nash) M. E. Jones (N. America, USA, ID, WA), G. erecta Hitchc. (N. America, USA, CA), G. grandis S. Wats. ex A. Gray (N. America, Canada, Ont., USA, WI), G. maxima (Hartm.) Holmb. (Europe, D), Hordeum vulgare L. (Europe, A, I), Leucopoa kingii (S. Wats.) W. A. Weber (N. America, USA, CO, UT), Lolium perenne L. (N. America, USA, OR; S. America, Chile), Phalaris arundinacea L. (N. America, USA, ID, MT, ND, SD, WI, WY), Triticale sp. (Mexico); (2) Cannabaceae: ? Cannabis sativa L. (Europe, A).
 
Taxon name: