Phytophthora himalsilva

Name and publication

Phytophthora himalsilva Vettraino, Brasier & Vannini (2011)

Vettraino AM, Brasier CM, Brown AV, and Vannini A. 2011. Phytophthora himalsilva sp. nov. an unusually phenotypically variable species from a remote forest in Nepal. Fungal Biol. 115: 275–287.

Corresponding author:


from Vettraino et al. 2011




refers to the area from which it was first isolated and described


Type: NEPAL, close to Seri, Bajura (district) isolated from rhizosphere of Quercus leuchotricophora in Oct. 2005. NP44. Holotype: CBS 128767

Ex-type: CBS 128753 and CBS 128754 (listed as isotypes)

Sequences for ex-type in original manuscript: Phytophthora himalsilva isolate 44 = ITS HM752784, β-tub HM752790, Cox1 HM752796

Ex-type in other collections

CBS 128767 (NP44) = CBS 128753 = CBS 128754 = P19820 (WOC/WPC), CPHST BL 102 (Abad), 61G2 (Yang)

Molecular identification

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

Phytophthora himalsilva isolate CPHST BL 102 (= P19820 WPC) = ITS rDNA MG865507, COI MH136901

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

Clade 2a

Morphological identification

adapted from Vettraino et al. (2011)

Colonies and cardinal temperatures

Colonies in PDA, V8A, or MEA with stellate to chrysanthemum pattern. Minimum temperature 9°C, optimum 20–27°C, maximum 31°C.

Conditions for growth and sporulation

Sporangia formed in pondwater or unsterilised soil leachate.

Asexual phase

Sporangia papillate, sometimes bipapillate; frequently caducous, with medium and short pedicels (5–17 µm long), subterminal or lateral; elongate, obpyriform, limoniform, mouse-shaped, some with tapered bases; originated in unbranched or branched sporangiophores. Hyphal swellings absent. Chlamydospores absent.

Sexual phase

Homothallic. Oogonia smooth-walled (27–28 µm diam); antheridia spherical, either paragynous or amphigynous, rarely both; oospores aplerotic, spherical (23–24 µm diam).

Most typical characters

Phytophthora himalsilva is characterized by the shape of the spherical small antheridia and the sporangia frequently with medium pedicels.

Additional specimen(s) evaluated

Phytophthora himalsilva ex-type CPHST BL 102, duplicate of P19820 (World Phytophthora Collection)

Hosts and distribution

Distribution: Asia (Nepal)
Substrate: rhizosphere soil
Host: Quercus leucotrichophora, Castanopsis (Fagaceae); Carpinus (Betulaceae); Cupressus (Cupressaceae)

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

Additional references and links

Fact sheet author

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