Phytophthora intricata

Name and publication

Phytophthora intricata Jung, Horta Jung, Scanu & Bakonyi (2017)

Jung T, Jung MH, Scanu B, Seress D, Kovács GM, Maia C, Pérez-Sierra A, Chang T-T, Chandelier A, Heungens K, van Poucke K, Abad-Campos P, Léon M, Cacciola SO, and Bakonyi J. 2017. Six new Phytophthora species from ITS Clade 7a including two sexually functional heterothallic hybrid species detected in natural ecosystems in Taiwan. Persoonia 38: 100–135.

Corresponding author:,


from Jung et al. (2017)




refers to the intricate, intertwining oogonial and antheridial stalks (intricata Lat = intricate or intertwining)


Type: TAIWAN, Fushan, isolated from rhizosphere soil of a planted Quercus tarokoensis tree, T. Jung, 2013 (CBS H-22553 holotype, dried culture on V8A, Herbarium CBS-KNAW Fungal Biodiversity Centre)

Ex-type: CBS 141211 = TW259 

Sequences for ex-type in original manuscript: Phytophthora intricata isolate TW259 = ITS rDNA KU517155, cox1 KU517149

Ex-type in other collections

CBS 141211 = TW259 

Molecular identification

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

Phytophthora intricata isolate TW259 ITS rDNA KU517155

Sequences for ex-type in other sources
  • NCBI: Phytophthora intricata TW259
  • Phytophthora DATABASE: Phytophthora intricata
  • EPPO-Q-bank: Phytophthora intricata
  • BOLDSYSTEMS: Phytophthora intricata
Position in ITS phylogenetic tree

Clade 7a

Morphological identification

adapted from Jung et al. (2017)

Colonies and cardinal temperatures

Colony morphology on V8A uniform, on MEA faintly stellate, and on PDA rosaceous. Minimum growth temperature 5 °C, optimum 30 °C, and maximum 35 °C.

Conditions for growth and sporulation

Sporangia not formed on solid agar but were produced abundantly in non-sterile soil extract. Gametangia readily produced on V8A in single culture.

Asexual phase

Sporangia nonpapillate; persistent; ovoid, elongated, obpyriform, limoniform, ellipsoid to less frequently pyriform, subglobose, ampulliform, bilobed or trilobed (39–78.9 μm length × 24.1–48.8 μm width); presenting internal (nested) and extended proliferation; originated on unbranched sporangiophores or in lax sympodia. Hyphal swellings absent. Chlamydospores absent.

Sexual phase

Homothallic. Oogonia smooth-walled, globose to subglobose (26.3–56.7 μm diam.) or slightly eccentric with a widened base between the oogonial stalk and the point of antheridial attachment; antheridia paragynous, subglobose to cylindrical, with antheridial stalks often twisted and intertwining; oospores plerotic (25.1–50.3 μm diam.), thick-walled, and contain two nuclei and a large ooplast.

Hosts and distribution

Distribution: Asia (Taiwan)
Substrate: rhizosphere soil
Host: Quercus tarokoensis (Fagaceae)

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

Additional references and links

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

Fact sheet author

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