Ustilago striiformis (Westend.) Niessl

Synonyms

Tilletia airae-caespitosae Lindr.
Tilletia alopecurivora Ule
Tilletia avenae Ule
Tilletia baryana A.A. Fisch. Waldh. (as "de Baryana")
Tilletia brizae Ule
Tilletia corcontica Bubák
Tilletia milii Fuckel
Tilletia salweyi (Berk. & Broome) P. Karst.
Tilletia striiformis (Westendorp) Sacc.
Tilletia striiformis (Westendorp) G. Winter
Uredo salweyi (Berkeley & Broome) Oudem.
Uredo striiformis Westend.
Uredo (Ustilago) longissima var. megalospora Riess
Ustilago agrostis-palustris W.H. Davis ex Cif.
Ustilago airae-caespitosae (Lindr.) Liro
Ustilago alopecurivora (Ule) Liro
Ustilago anthoxanthi Liro
Ustilago brizae (Ule) Liro
Ustilago bromina Syd.
Ustilago clintoniana W.H. Davis
Ustilago corcontica (Bubák) Liro
Ustilago festucarum Liro
Ustilago hierochloae-odoratae (Savul. & Rayss) Cif.
Ustilago jaczevskyana var. jaczevskyana Lavrov (as "var. typica Lavrov")
Ustilago jaczevskyana var. sibirica Lavrov
Ustilago johnstonii Cif.
Ustilago kairamoi Liro
Ustilago linearis Cif.
Ustilago loliicola Cif.
Ustilago megalospora (Riess) Cif.
Ustilago milii (Fuckel) Liro
Ustilago notarisii A.A. Fisch. Waldh. (as "de Notarisii")
Ustilago phlei-pratensis W.H. Davis ex Cif.
Ustilago poae S. Ito
Ustilago poae-annuae W.H. Davis
Ustilago poae-bulbosae Savulescu
Ustilago poae-nemoralis Vienn.-Bourg.
Ustilago poae-pratensis W.H. Davis
Ustilago poarum McAlpine
Ustilago salweyi Berk. & Broome (as "salveii")
Ustilago scaura Liro
Ustilago striaeformis f. agrostis-palustris W.H. Davis
Ustilago striaeformis f. phlei-pratensis W.H. Davis
Ustilago striiformis f. hierochloae-odoratae Savul. & Rayss
Ustilago taenia Cif.
Ustilago triseti Liro
Ustilago washingtoniana Ellis & Everh.

Description

Sori in leaves, leaf sheaths and culms as streaks parallel with the veins, occasionally fused and covering most of the leaf surface, rarely in the inflorescence and exceptionally in the ovaries. At first covered by the epidermis which soon ruptures, the dark brown semi-powdery to powdery spore mass becoming scattered and the leaf-blades often shred. Infection systemic; the fungus perennating as a mycelium in crowns, stolons or other organs.

Spores globose, ovoid to irregular, 9–15 (–16) × 8–12 (–13) µm, light olivaceous brown, finely to prominently echinulate.

Spore germination resulting in septate basidia that produce lateral branches or, under different conditions, basidiospores.

Hosts
   
Host family: Poaceae
   
Host species: Agrostis capillaris L.
Agrostis gigantea Roth
Agrostis parviflora R.Br.
Agrostis stolonifera L.
Avena strigosa Schreb.
Dactylis glomerata L.
Holcus lanatus L.
Lolium perenne L.
Poa annua L.
Poa costiniana Vickery
Poa hiemata Vickery
Poa pratensis L.

Distribution

States & Territories: NSW, SA, TAS, VIC, WA

Comments

Within U. striiformis s. lat. there are specialised forms confined to certain host species or genera. Moreover, spore shape, dimensions and ornamentation vary markedly between specimens infecting different host genera, the same host genus (Mäkinen, 1963), or even the same host species. Due to the lack of a comparative study of this group, and because of the presence of intermediate forms, we are treating this species in a broad sense.

For discussion of the nomenclature, and use of the name U. striiformis instead of the older
U. salweyi, see Stevenson (1946: 53–59) and Lindeberg (1959: 136).