Phytophthora ludoviciana

Name and publication

Phytophthora ludoviciana T. Jung, T. Corcobado, S. Raghuwinder & I. Milenković (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 slender shape of many sporangia (procera Lat. = slender).


Type: USA, Louisiana, Archie, isolated from a naturally fallen leaf in a flooded swamp forest. March 2020, T. Corcobado & T. Májek, holotype HNHM-MYC-009704, dried culture on V8A, Herbarium of the Hungarian Natural History Museum, Budapest, Hungary

Ex-type: culture CBS 149226 = NRRL 64144 = LU013

Sequences for ex-type in original manuscript:  LSU ON000673, ITS ON000767, β-tubulin OM975946, hsp90 OM976463, tigA OM974640, rpl10 OM974500, tef-1a OM984926, cox1 ON013833, ypt1 ON024983, nadh1 OM976942, rps10 OM9766701

Molecular identification

Position in ITS phylogenetic tree

Clade 10a

Morphological identification

Colonies and cardinal temperatures

Colony morphology submerged and radiate on V8A, petaloid with limited aerial mycelium on CA, and dense-felty, rosaceous with submerged margins on PDA. Optimum growth temperature 27.5°C and maximum 32.5°C.

Conditions for growth and sporulation

Sporangia produced in non-sterile soil extract after 2–3d. Oogonia were not produced in paired cultures using several known tester strains.

Asexual phase

Sporangia were nonpapillate, persistent, and predominantly ovoid to elongated ovoid in shape. Sporangia averaged 60.2 x 25.2 µm (overall range 30.6–84.9 x 15.6–30.4 µm), proliferation internal, nested, and extended. Sporangiophores unbranched. Hyphae undulating; hyphal swellings rare. Chlamydospores absent.

Sexual phase

Sterile in culture.

Most typical characters

Resides in phylogenetic clade 10d, with two other species all recovered from fallen leaves in swamp forest, Louisiana, USA.

Additional specimen(s) evaluated

USA, Louisiana, Archie, isolated from a naturally fallen leaf in a flooded swamp forest. March 2020, T. Corcobado & T. Májek, LU007, LU010, LU056.

Hosts and distribution

Distribution: USA
Substrate: fallen leaf
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