Phytophthora scadinavica

Name and publication

Phytophthora scandinavica T. Jung, I. Milenković, M.A. Redondo, T. Corcobado (2022)

Jung T, Milenković I, Corcobado T. et al. 2022. Extensive morphological and behavioural diversity among fourteen new and seven described species in Phytophthora Clade 10 and its evolutionary implications. Persoonia-Molecular Phylogeny and Evolution of Fungi 49: 1–57.





Name refers to the origin of all known isolates in the Scandinavian country Sweden (scandinavica Lat. = from Scandinavia).


Type: Sweden, Kiruna area, isolated from riverbank soil, Sept. 2017, I. Milenković & T. Corcobado, holotype HNHM-MYC-009708, dried culture on V8A, Herbarium of the Hungarian Natural History Museum, Budapest, Hungary;

Ex-type: CBS 149204 = NRRL 66990 = SW325

Sequences for ex-type in original manuscript:  LSU ON000692, ITS ON000786, β-tubulin OM975965, hsp90 OM976482, tigA OM974659, rpl10 OM97519, tef-1a OM984940, enolase OM976576, cox1 ON013852, ypt1 ON025002, nadh1 OM976961, rps10 OM976720

Molecular identification

Position in ITS phylogenetic tree

Clade 10c

Morphological identification

Colonies and cardinal temperatures

Colony morphology submerged and faintly petaloid on V8A and CA, and stoloniferous, dense-felty colonies on PDA. Optimum growth temperature 20°C and maximum 27.5°C.

Conditions for growth and sporulation

Sporangia produced in non-sterile soil extract after 1–2d. Oogonia produced readily in single culture on V8A after 2–3 weeks.

Asexual phase

Sporangia were nonpapillate, persistent, and predominantly ovoid to broad ovoid and obpyriform in shape. Sporangia averaged 59.2 x 37.1 µm (overall range 35.5–72.4 x 28.3–50.8 µm), proliferation internal, nested. Sporangiophores unbranched. Hyphal swellings present. Chlamydospores absent.

Sexual phase

Homothallic. Oogonia smooth-walled, predominantly globose but 33% were excentric, 19–64 µm. Oospores aplerotic, thin-walled, size ranged 17–52 µm. Antheridia paragynous.

Most typical characters

Resides in phylogenetic clade 10c, with Phytophthora intercalaris. These two species can be differentiated as P. scandinavica is homothallic and does not produce chlamydospores.

Additional specimen(s) evaluated

Sweden, Kiruna area, isolated from riverbank soil, Sept. 2017, I. Milenković & T. Corcobado, SW314, SW315, SW316, SW326, SW327.

Hosts and distribution

Distribution: Sweden
Substrate: riverbank soil
Disease note: no known disease
Host: no known host

Additional references and links

none available

Fact sheet author

Treena Burgess, Ph.D., Phytophthora Science and Management, Harry Butler Institute, Murdoch University