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Morphological Structure

Clades


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Phytophthora boodjera
Phytophthora spp. in Clade 4: portion of the seven-loci ML phylogeny featuring the type cultures of 212 described species (by T. Bourret). Notice the position of P. boodjera Ex-type CBS 138637 = S&T BL 181. Gloria Abad, USDA S&T.
Phytophthora boodjera
Phytophthora spp. in Clade 4: Morphological Tabular key (PDF) and Tabular key legends (PDF) in IDphy2 KEY SECTION. Notice the data of P. boodjera Ex-type CBS 138637 = S&T BL 181. Gloria Abad, USDA S&T.  
Phytophthora boodjera

Phytophthora boodjera colony of the ex-type grown for 7 days at 20°C on: a) carrot agar, b) V8® agar, c) malt extract agar, d) half-strength potato-dextrose agar

Phytophthora boodjera

ovoid to broadly ovoid papillate sporangia of Phytophthora boodjera formed on V8A flooded with soil extract


Phytophthora boodjera

aplerotic oospores of P. boodjera with paragynous antheridia; scale bar = 20 μm

Phytophthora borealis
Phytophthora spp. in subclade 6b: portion of the seven-loci ML phylogeny featuring the type cultures of 212 described species (by T. Bourret). Notice the position of P. borealis Ex-type CBS 132023 = S&T BL 93. Gloria Abad, USDA S&T.
Phytophthora borealis
Phytophthora spp. in subclade 6b: Morphological Tabular key (PDF) and Tabular key legends (PDF) in IDphy2 KEY SECTION. Notice the data of P. borealis Ex-type CBS 132023 = S&T BL 93. Gloria Abad, USDA S&T.
Phytophthora borealis

Phytophthora borealis asexual and sexual phases of the ex-type: (a) isolate AKWA58.1-0708 on V8S (left) and CA (right) at 15 days, (2a-c) semipapillate persistent sporangia (2b,2c) with external proliferation, (3a-3b) oogonia, amphigynous antheridia and oospores formed by isolate AKWA 72.3-0708 when paired with A2 tester of P. cryptogea; Scale bars = 20μm; photos by Hansen et al 2012.


Phytophthora borealis

Phytophthora borealis cultures of the ex-type: isolate AKWA58.1-0708 on V8S (left) and CA (right) at 15 days; photo by Hansen et al 2012.

Phytophthora borealis

Phytophthora borealis asexual phase of the ex-type: nonpapillate persistent sporangia with internal proliferation; Scale bar = 20μm; photos by Hansen et al 2012.

Phytophthora borealis

Phytophthora borealis asexual phase of the ex-type: nonpapillate persistent sporangium; Scale bar = 20μm; photos by Hansen et al 2012.

Phytophthora borealis

Phytophthora borealis sexual phase of the ex-type: oogonium, amphigynous antheridium and oospore formed by isolate AKWA 72.3-0708 when paired with A2 tester of P. cryptogea; Scale bar = 20μm; photo by Hansen et al 2012.


Phytophthora borealis

Phytophthora borealis asexual phase of the ex-type: nonpapillate persistent sporangia with internal proliferation; Scale bar = 20μm; photos by Hansen et al 2012.

Phytophthora borealis

Phytophthora borealis sexual phase of the ex-type: oogonia, amphigynous antheridia and oospores formed by isolate AKWA 72.3-0708 when paired with A2 tester of P. cryptogea; Scale bar = 20μm; photo by Hansen et al 2012.

Phytophthora botryosa
Phytophthora spp. in subclade 2a: portion of the seven-loci ML phylogeny featuring the type cultures of 212 described species (by T. Bourret). Notice the position of P. botryosa Ex-type CBS 581.69 = S&T BL 132. Gloria Abad, USDA S&T.
Phytophthora botryosa
Phytophthora spp. in subclade 2a: Morphological Tabular key (PDF) and Tabular key legends (PDF) in IDphy2 KEY SECTION. Notice the data of P. botryosa Ex-type CBS 581.69 = S&T BL 132. Gloria Abad, USDA S&T. 

Phytophthora botryosa

Phytophthora botryosa (Abad Ph450) selected specimen: (a) colony on V-8 agar, (b-h) semipapillated sporangia, (b) produced in botryose clumps, (c) sporangia produced in botryose simple sympodial sporangiophore; (e-h) sporangia with medium-length pedicel; (d) chlamydospores (arrows); (i, j) oogonia with amphigynous antheridia produced after pairings with opposite type; photos by G. Abad, USDA-APHIS-PPQ

Phytophthora brassicae
Phytophthora spp. in subclade 8b: portion of the seven-loci ML phylogeny featuring the type cultures of 212 described species (by T. Bourret). Notice the position of P. brassicae Ex-type CBS 179.87 = S&T BL 8. Gloria Abad, USDA S&T.
Phytophthora brassicae
Phytophthora spp. in subclade 8b: Morphological Tabular key (PDF) and Tabular key legends (PDF) in IDphy2 KEY SECTION. Notice the data of P. brassicae Ex-type CBS 179.87 = S&T BL 8. Gloria Abad, USDA S&T.
Phytophthora brassicae

Phytophthora brassicae (CPHST BL 8) colonies of the ex-type grown for 7 days on (a) V8® Agar, (b) potato dextrose agar, and (c) malt extract agar; photo by Krysta Jennings and Leandra Knight, USDA-APHIS-PPQ


Phytophthora brassicae

Phytophthora brassicae ex-type CPHST BL 8, asexual phase (a-f): (a, b) sporangia produced in sporangiophores, (c) sporangium showing internal plug, (d) sporangium with internal proliferation, (e) sporangium with external proliferation, (f) globose sporangium; photos by G. Abad, USDA-APHIS-PPQ.

Phytophthora brassicae

Phytophthora brassicae ex-type CPHST BL 8, asexual phase: sporangium with internal proliferation. Photo by G. Abad, USDA-APHIS-PPQ.

Phytophthora brassicae

Phytophthora brassicae ex-type CPHST BL 8, asexual phase: sporangium with external proliferation. Photo by G. Abad, USDA-APHIS-PPQ.

Phytophthora brassicae

Phytophthora brassicae ex-type CPHST BL 8, asexual phase: sporangia produced in sporangiophores. Photo by G. Abad, USDA-APHIS-PPQ.


Phytophthora brassicae

Phytophthora brassicae ex-type CPHST BL 8, asexual phase: globose sporangium (chlamydospores absent in species). Photo by G. Abad, USDA-APHIS-PPQ.

Phytophthora brassicae

Phytophthora brassicae ex-type CPHST BL 8, asexual phase: sporangium showing internal plug. Photo by G. Abad, USDA-APHIS-PPQ.

Phytophthora brassicae

Phytophthora brassicae ex-type CPHST BL 8, asexual phase: sporangia produced in sporangiophore. Photo by G. Abad, USDA-APHIS-PPQ.

Phytophthora cactorum (in progress - Abad et al. 2023b)
Phytophthora spp. in subclade 1a: portion of the seven-loci ML phylogeny featuring the type cultures of 212 described species (by T. Bourret). Notice the position of P. cactorum selected specimen CBS 231.30 = S&T BL 9. Gloria Abad, USDA S&T.

Phytophthora cactorum (in progress - Abad et al. 2023b)
Phytophthora spp. in subclade 1a: Morphological Tabular key (PDF) and Tabular key legends (PDF) in IDphy2 KEY SECTION. Notice the data of P. cactorum selected specimen CBS 231.30 = S&T BL 9. Gloria Abad, USDA S&T.
Phytophthora cactorum (in progress - Abad et al. 2023b)

Phytophthora cactorum (CPHST BL 9) colony of a selected specimen grown for 7 days on (a) V8® agar (b) potato dextrose agar (c) malt extract agar; photos by Krysta Jennings and Leandra Knight, USDA-APHIS-PPQ

Phytophthora cactorum (in progress - Abad et al. 2023b)

Phytophthora cactorum (CPHST BL 178) colony of a selected specimen grown for 7 days on (a) V8® agar (b) potato dextrose agar (c) malt extract agar; photos by Krysta Jennings and Leandra Knight, USDA-APHIS-PPQ

Phytophthora cactorum (in progress - Abad et al. 2023b)

Phytophthora cactorum (CPHST BL 9) asexual phase formed on V8 agar flooded with soil extract (a-c): (a) sporangia originated in lax sympodial sporangiophore, chlamydospore in bottom left (arrow), (b) papillate caducous sporangia with short pedicel, (c) papillate caducous sporangium with short pedicel, (d) chlamydospore; photos by G. Abad, USDA-APHIS-PPQ.