Phytophthora formosa

Name and publication

Phytophthora formosa 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 origin of all known isolates in Taiwan (formosa Lat = the beautiful one; previous name of Taiwan)


Type: TAIWAN, Lenhuachih, isolated from rhizosphere soil of a mature Araucaria cunninghamii tree, T. Jung, 2013 (CBS H-22551 holotype, dried culture on V8A, Herbarium CBS-KNAW Fungal Biodiversity Centre)

Ex-type: CBS 141203 = TW107

Sequences for ex-type in original manuscript: Phytophthora formosa isolate TW107 = ITS KU517153, cox1 KU517147

Ex-type in other collections

CBS 141203 = TW107 = 67C4 (Yang)

Molecular identification

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

Phytophthora formosa isolate TW107 ITS rDNA KU517153

Sequences for ex-type in other sources
  • NCBI: Phytophthora formosa TW107 
  • Phytophthora DATABASE: Phytophthora formosa
  • EPPO-Q-bank: Phytophthora formosa
  • BOLDSYSTEMS: Phytophthora formosa
Position in ITS phylogenetic tree

Clade 7a

Morphological identification

adapted from Jung et al. (2017)

Colonies and cardinal temperatures

Colonies on V8A and PDA uniform and woolly, on MEA faintly dendroid with small-lobed margins. Optimum growth temperature 25°C, and maximum 30–35°C.

Conditions for growth and sporulation

Sporangia not observed on solid agar but were produced abundantly in non-sterile soil extract; gametangia produced in single culture on V8A.

Asexual phase

Sporangia nonpapillate; persistent; ovoid, elongated, ellipsoid, obpyriform, limoniform, subglobose, or rarely pyriform, obturbinate, or funnel-like; showing internally (nested) and extended proliferation; originated on unbranched sporangiophores. Hyphal swellings absent. Chlamydospores absent.

Sexual phase

Homothallic. Oogonia smooth-walled, globose to subglobose or slightly eccentric often with a tapering base (27.1–50 μm diam.); antheridia predominantly paragynous, clavate, subglobose to cylindrical; oospores plerotic, globose, and usually contain a large ooplast (22.4–42.5 μm diam.).

Hosts and distribution

Distribution: Asia (Taiwan)
Substrate: rhizosphere soil
Host: Araucaria cunninghamii (Araucariaceae), Quercus glandulifera (Fagaceae)

Retrieved January 30, 2018 from U.S. National Fungus Collections Nomenclature Database.

Additional references and links

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

Fact sheet author

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