24 Nov 2025
#RustOfTheWeek
Tranzschelia fusca (Pers.) Dietel, on Anemone nemorosa L. (Ranunculaceae)
Spermogonia, telia and teliospores
York, Appleton, England
3
50
27 Oct 2025
#RustOfTheWeek
Puccinia thlaspeos Ficinus & C. Schub.
On Noccaea stenocarpa (Brassicaceae)
Iran, Alborz province, Dizin road, alt. 2650 m
#lepto_Puccinia
#montane_rust
A & B. Teliospores, C. Notched teliospore in telium, D. Germinating teliospores (Bar = 20 µm)
5
79
28 Sep 2025
#RustOfTheWeek
Melampsora bigelowii Thüm., urediniospores and uredinial paraphyses on Salix lasiandra Benth. (Salicaceae)
United States, California, San Mateo, Searsville
5
55
21 Sep 2025
#RustOfTheWeek
#Puccinia_calcitrapae_var_cirsii_rhizocephali
Puccinia calcitrapae var. cirsii-rhizocephali M. Abbasi, broadly-ellipsoid or broadly-obovoid teliospores
on Cirsium rhizocephalum C.A.Mey. (Asteraceae), Alborz province, Iran
3
61
7 Sep 2025
#RustOfTheWeek
#Uromyces_savulescui
Uromyces savulescui Rayss, II III, on Limonium sinuatum (Plumbaginaceae), Cajamarca, Peru
Cinnamon brown densely verrucose urediniospores and colorless teliospores doi.org/10.1094/PDIS-07-23-1…
3
94
30 Aug 2025
#RustOfTheWeek
#Puccinia_stipae_var_stipina
Puccinia stipae var. stipina (Tranzschel ex Kleb.) H.C. Greene & Cummins (=P. stipina)
II III on Stipa pennata subsp. zalesskii (Wilensky) Freitag (=S. zalesskii) (Poaceae)
Iran, Mazandaran
black & white photomicrography
5
73
28 Jul 2025
#RustOfTheWeek
#Puccinia_hordei
Puccinia hordei G.H. Otth, Barley leaf rust, on Hordeum vulgare, BC, Canada;
Cross section of subepidermal loculate telia;
brownish stromatic fan-shape paraphyses tending to divide the sorus into locules
1
12
188
20 Jul 2025
#RustOfTheWeek
#Tranzschelia_iranica
#Cerasus_microcarpa
Tranzschelia iranica M. Abbasi & Gjaerum
on Cerasus microcarpa subsp. microcarpa (Rosaceae)
#Iran
5
73
12 May 2025
#RustOfTheWeek
#Melampsoridium_carpini
#Carpinus
Melampsoridium carpini on Carpinus; cross section of uredinium showing urediniospores (U); peridium (P) and differentiated ostiolar cell (OC) tapering into an acute apex. #Mazandaran #Iran
2
106
5 May 2025
#RustOfTheWeek
#Puccinia_aeluropodis
#Aeluropus_littoralis
Puccinia aeluropodis Ricker, teliospores on Aeluropus littoralis (Poaceae)
Lavan Island, Persian Gulf, Iran
#persiangulf
5
127
28 Apr 2025
#RustOfTheWeek
#Puccinia_tanaceti
#Tanacetum_vulgare
Puccinia tanaceti DC.
Tanacetum vulgare L. (Asteraceae)
#common_tansy rust; ellipsoid or obovoid, teliospores with rounded, conic-rounded or unequal apex, constricted at septum
North Vancouver, BC, CANADA
6
148
21 Apr 2025
#RustOfTheWeek
#Puccinia_achilleae
#Achillea #yarrow
Puccinia achilleae Cooke, on Achillea sp.,
Urediniospores and teliospores, Iran
Yarrow rust
3
79
14 Apr 2025
#RustOfTheWeek
#Puccinia_phragmitis
#Phragmites_australis
#common_reed
Puccinia phragmitis (Schumach.) Körn., on Phragmites australis (Poaceae) [common reed]; urediniospores and teliospores packed together; NW Iran
6
101
6 Apr 2025
#RustOfTheWeek
#Phragmidium_montivagum
#Rosa_sayi
Phragmidium montivagum Arthur, teliospores (8-9 celled) and uredinial paraphyses on Rosa sayi Schwein (Rosaceae); Crow Creek, Laramie, Albany County, Wyoming, USA
1
7
168
31 Mar 2025
#RustOfTheWeek
#Tranzschelia_arthurii
#Hepatica_americana_var_acuta
Tranzschelia arthurii Tranzschel & M.A. Litv., on Hepatica americana var. acuta (Ranunculaceae)
Spermogonia and aecia with rupturing peridium into 4-5 lobes, USA, Iowa, Decorah
3
64
22 Mar 2025
#RustOfTheWeek
#Pileolaria_terebinthi
#Pistachio_rust
Pileolaria terebinthi, one celled teliospores with persistent pedicels, up to 370 um long, Iran
This rust is mainly distributed in the Mediterranean and Western Asia on Pistacia species
1
9
171
15 Mar 2025
#RustOfTheWeek
#Gymnotelium_blasdaleanum
on #Saskatoon_serviceberry
Gymnotelium blasdaleanum (=Gymnosporangium libocedri) on Saskatoon serviceberry (Amelanchier alnifolia), dense fructicolous aecidioid aecia; British Columbia, Canada
1
6
143
2 Mar 2025
#RustOfTheWeek
#Uromyces_laevis on #Euphorbia_virgata
papillate teliospores of Uromyces laevis on Euphorbia virgata (Euphorbiaceae)
East Azerbaijan province, Iran
2
75
22 Feb 2025
#RustOfTheWeek
#Puccinia_goldsbroughii
Puccinia goldsbroughii on Melica nitens, Missouri, south of Pierpont, USA
showing 2-celled teliospores and mesospores in semi-compact telium
named after Prof. Peter Goldsbrough, Purdue University
@Purdue
6
127
16 Feb 2025
#RustOfTheWeek
#Puccinia_fritschii
Puccinia fritschii (teliospores) on Tulipa biflora, Iran, Markazi province
named after the German botanist and Allium specialist Dr. Reinhard M. Fritsch
7
169