Phytophthora macilentosa

Name and publication

Phytophthora macilentosa Yang, Copes & Hong (2014)

Yang X, Copes WE, and Hong C. 2014. Two novel species representing a new clade and cluster of Phytophthora. Fungal Biology 118: 72–82.

Corresponding author: Xiao Yang yxiao9@vt.edu

Nomenclature

from Yang et al. (2014)

Mycobank

MB804934

Etymology

refers to the elongated sporangia with great length to width ratio frequently produced by this species

Typification

Type: UNITED STATES OF AMERICA, recovered from the middle of water column in a nursery reservoir, Mississippi, February, 2012; holotype ATCC MYA-4945

Ex-type: 58A7

Sequences for ex-type in original manuscript: 58A7 = ITS rDNA KF192700, cox1 KF192708

Ex-type in other collections

58A7 = P19993 (WPC), CPHST BL 125 (Abad), 58A7 (Yang)

Molecular identification

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

Phytophthora macilentosa isolate CPHST BL 125 (= P19993 WPC) = ITS rDNA MG865527, COI MH136922

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

Clade 9a

Morphological identification

adapted from Yang et al. (2014)

Colonies and cardinal temperatures

Minimum temperature for growth is 10°C, optimum 30°C, and maximum 37°C. 

Conditions for growth and sporulation

Phytophthora macilentosa produce abundant sporangia in V8 cultures flooded with 10% soil solution.

Asexual phase

Sporangia nonpapillate, persistent; obpyriform, ovoid, limoniform, ellipsoid, pyriform, and distorted shapes such as peanut-shaped; showing internal, nested, and extended proliferation. Hyphal swellings catenulate or elongated with irregular shapes are produced in old cultures. Chlamydospores absent.

Sexual phase

Sterile/heterothallic.

Addtional specimen(s) evaluated

Phytophthora macilentosa CPHST BL 125, duplicate of P19993 (World Phytophthora Collection), which is a duplicate of ATCC MYA-4945

Hosts and distribution

Distribution: North America (USA: CT, MS)
Substrate: isolated from water

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