Phytophthora ornamentata

Name and publication

Phytophthora ornamentata Scanu, Linaldeddu & Jung (2015)

Scanu B, Linaldeddu BT, Deidda A, and Jung T. 2015. Diversity of Phytophthora species from declining Mediterranean maquis vegetation, including two new species, Phytophthora crassamura and P. ornamentata sp. nov. PLoS ONE 10 (12): e0143234. Doi:10.1371/journal.pone.0143234

Corresponding author:


from Scanu et al. (2014)


MB 814009


refers to the ornamentation of the oogonial wall


Type: ITALY, Sardinia. Isolated from rhizosphere soil collected beneath declining Pistacia lentiscus; collected: B. Scanu, 2012; CBS H-22393 (holotype, dried culture on CA, Herbarium CBS-KNAW Fungal Biodiversity Centre)

Ex-type: CBS 140647 = PH152 (culture ex-type)

Sequences for ex-type: Phytophthora ornamentata isolate PH152 ITS rDNA KP863496, cox1 KP863486

Ex-type in other collections

CBS 140647 = P19906 (WPC/WOC), CPHST BL 152 (Abad), 66D2 (Hong)

Molecular identification

Voucher sequences for barcoding genes (ITS rDNA and COI) of the ex-type (see Molecular protocols page)

Phytophthora ornamentata isolate CPHST BL 152B (= P19906 WPC) = ITS rDNA MG865556, COI MH136947

Sequences for ex-type in other sources
Position in ITS phylogenetic tree

Clade 6b

Morphological identification

adapted from Scanu et al. (2014)

Colonies and cardinal temperatures

Colony morphology after 7 days on PDA, CMA, and MEA with no distinct pattern. Minimum growth temperature 5°C; optimum 25°C, and maximum 33°C.

Conditions for growth and sporulation

Phytophthora ornamentata produces sporangia only rarely in solid media (CA) but readily though not abundantly when CA plugs are flooded with nonsterile soil extract water after 24–48 hours of incubation at 20°C.

Asexual phase

Sporangia nonpapillate, persistent; ovoid, obpyriform, ellipsoid (39–79 x 21–53 µm) proliferating internally in both a nested, never external proliferation and originated on unbranched sporangiophores. Hyphal swellings globose, elongated, and catenulated. Chlamydospores absent. 

Sexual phase

Homothallic. Oogonia ornamented (28–42 µm diam); antheridia predominately paragynous (11–20 x 9–18 µm); oospores slightly aplerotic (27–43 µm diam).

Additional specimen(s) evaluated

Phytophthora ornamentata ex-type CPHST BL 152, duplicate of P19906 (World Oomycetes/Phytophthora Collection), which is a duplicate of the ex-type CBS 140647

Hosts and distribution

Distribution: Europe (Italy)
Substrate: rhizosphere soil/roots
Disease Note: decline
Host: Pistacia lentiscus (Anacardiaceae)

Retrieved January 31, 2018 from U.S. National Fungus Collections Nomenclature Database.

Additional references and links

  • Phytophthora DATABASE: Phytophthora rnamentata
  • EPPO-Q-bank: Phytophthora ornamentata
  • SMML USDA-ARS: Phytophthora ornamentata
  • EPPO Global Database: Phytophthora ornamentata
  • CABI Invasive Species Compendium: Phytophthora ornamentata
  • Encyclopedia of Life (EOL): Phytophthora ornamentata
  • Index Fungorum (IF): Phytophthora ornamentata
  • Plantwise Knowledge Bank: Phytophthora ornamentata

Fact sheet author

Z. Gloria Abad, Ph.D., USDA-APHIS-PPQ-S&T Beltsville Laboratory, United States of America