#Rust on dog's #mercury (Mercurialis perennis) caused by #Melampsora rostrupii (Bois de Morval, Cléry-en-Vexin, FR).

#Rust of common #spindle (Euonymus europaeus) caused by #Melampsora euonymi-caprearum (Les Clayes-sous-Bois, FR).

New species and new records of genus Melampsora (Melampsoraceae) from Pakistan using electron microscopy and DNA barcoding techniques - BMC Plant Biology The genus Melampsora, known for its significant role as a plant pathogen, exhibits a rich species diversity. Current study reports Melampsora himalayensis sp. nov. as new species with M. ferrinii and M. populnea as new records from different regions (Fairy Meadows, Gilgit Baltistan; Khanspur, Khyber Pakhtunkhwa) of Pakistan, contributing to the knowledge of rust fungi diversity and distribution. Their placement within genus Melampsora was validated by comparative morpho-anatomical investigation. Detailed morphological characterization was employed using Scanning electron microscopy which provided features of spore morphology including their surface ornamentation. Additionally, molecular analysis was performed for species delimitation and to resolve phylogenetic relationships within genus Melampsora. Combined morpho-anatomical and phylogenetic data led to the discovery of previously unrecorded species, Melampsora ferrinii and M. populnea from Pakistan, including a novel taxon, Melampsora himalayensis sp. nov. This study provides information about taxonomy, host range and distribution of Melampsora in Pakistan.

New species and new records of genus Melampsora (Melampsoraceae) from Pakistan using electron microscopy and DNA barcoding techniques

#Melampsora
#Melampsoraceae

link.springer.com/article/10.1...

#Rust of sweet spurge (#Euphorbia dulcis) caused by #Melampsora euphorbiae-dulcis (near Moudeyres, FR).

#Rust of perennial flax (#Linum perenne) caused by #Melampsora liniperda (Moudeyres, FR).

#Rust on white #poplar (Populus alba) caused by #Melampsora sp., likely M. aecidioides (Saint-Rome de Tarn, FR).

(1/3) Just received from an ecologist colleague 🙏, for diagnosis (and my pleasure): this sample of #rust on tree spurge (#Euphorbia dendroides) endemic to the Côte d'Azur, caused par #Melampsora gelmii, here displaying uredinia and telia (Mont Boron, Nice, FR).

#Micodiplosis larvae feeding on pulvinate aecia of #Melampsora rostrupii on #Mercurialis perennis (#rust on dog's #mercury) (Cléry-en-Vexin, FR).

#Micodiplosis larvae feeding on pulvinate aecia of #Melampsora rostrupii on #Mercurialis perennis (#rust on dog's #mercury) (Cléry-en-Vexin, FR).

Early #rust infection of common spindle (#Euonymus europaeus) caused by #Melampsora euonymi-caprearum, here with a cluster of spermogonia on a leaf and the first aecia on a stem (Villepreux, FR).

#Rust on black poplar (#Populus nigra) caused by #Melampsora sp. (likely M. laricis-populina, @pascal_frey?), here with uredinia and telia (Verdale, FR).

#Rust on aquatic saxifrage (#Saxifraga aquatica), endemic plant of the Pyrénées, here with urediniospores (16-24 x 24-32 µm) but not paraphyses (Pas de la Casa, AD). I suspect #Melampsora durrieui. Always a pleasure to find a rare rust (not in K&S 2015) on its rare host plant 🤩.

Again a #rust of spurge (likely #Euphorbia helioscopia) likely caused by #Melampsora helioscopiae, with uredinia and telia, found in the famous "Hameau de la Reine", a rustic retreat in the park of the Château de Versailles built for Marie Antoinette in 1783 (Versailles, FR).

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(3/4) #Euphorbia helioscopia is infected by #Melampsora sp. (M. heliscopiae or M. euphorbiae), here with uerediniospores and paraphysen [erratum#2; thanks @striiformis 🙏🏻].

#Rust of sun spurge (#Euphorbia helioscopia) likely caused by #Melampsora helioscopiae, here with urediniospores and teliospores (Millau, FR).

Very early symptoms of #Melampsora aecidioides causing "flag-shoot" symptom on white #poplar (Populus alba), Les Clayes-sous-Bois, FR. The #rust appears as the buds, in which it has overwintered, are just starting to emerge.

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#Rust on European aspen (#Populus tremula) caused by #Melampsora sp. (maybe M. larici-tremulae), here with orange uredinia and brown subepidermic telia (Les Clayes-sous-Bois, FR).

#Rust on European aspen (#Populus tremula) caused by #Melampsora sp. (maybe M. larici-tremulae), here with orange uredinia and brown subepidermic telia (Les Clayes-sous-Bois, FR).

#Rust on white #poplar (Populus alba) caused by #Melampsora sp. (Bois-d'Arcy forest, FR). Uredinia are protruding on the upper face of some leaves and in clusters on ribs. I suspect M. rostrupii, but it could be M. aecidioides... 🤯 @pascal_frey

#Rust on white #poplar (Populus alba) caused by #Melampsora sp. (Bois-d'Arcy forest, FR). Uredinia are protruding on the upper face of some leaves and in clusters on ribs. I suspect M. rostrupii, but it could be M. aecidioides... 🤯 @pascal_frey

#Rust of blunt-leaved willow (Salix retusa) caused by a specimen of #Melampsora sp. belonging the the Melampsora epitea complex (M. reticulatae, M. laricis-epitea or M. artica? 🤯), here with urediniospores and thick-walled paraphyses (Parc de la Vanoise, Tignes, FR).

#Rust of blunt-leaved willow (Salix retusa) caused by a specimen of #Melampsora sp. belonging the the Melampsora epitea complex (M. reticulatae, M. laricis-epitea or M. artica? 🤯), here with urediniospores and thick-walled paraphyses (Parc de la Vanoise, Tignes, FR).

#Rust on net-leaved willow (Salix reticulata, intriguing dwarf tree species typical of alpin grassland) caused by Melampsora sp., likely #Melampsora reticulatae, here with urediniospores and numerous paraphyses (Parc de la Vanoise, Tignes, FR). Thanks @striiformis for help 🙏.

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#Rust on net-leaved willow (Salix reticulata, intriguing dwarf tree species typical of alpin grassland) caused by Melampsora sp., likely #Melampsora reticulatae, here with urediniospores and numerous paraphyses (Parc de la Vanoise, Tignes, FR). Thanks @striiformis for help 🙏.

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#Rust on halberd willow (Salix hastata) caused by a #Melampsora sp. belonging to the M. epitea complex (Parc de la Vanoise, Tignes, FR).

#Rust on halberd willow (Salix hastata) caused by a #Melampsora sp. belonging to the M. epitea complex (Parc de la Vanoise, Tignes, FR).

(3/3) #Melampsora euphorbiae, here with caeoma-type aecia on basal leaves and stems.

Easier and satisfying 😎 to identify a #rust when primary & alternate hosts are side-by-side: here, #Melampsora allii-populina on #Arum maculatum in the shade of #Populus nigra along the Tarn river (Saint-Rome de Tarn, FR).

#Rust of common #spindle (Euonymus europaeus) caused by #Melampsora euonymi-caprearum, here the upper side of the leaf with spermogonia and the underside of another one with aecia (Les Clayes-sous-Bois, FR).

#Rust of sun spurge (#Euphorbia helioscopia) likely caused by #Melampsora helioscopiae, here with urediniospores & paraphyses (head width 18-22 µm, higher than M. euphorbiae; K&S 2015), found at the edge of your experimental oilseed rape plot @MBalesdent (Thiverval-Grignon, FR).