Trichobasis ari (Desm.) Lév., in Orbigny, Dict. Univ. Hist. Nat. 12: 785 (1849)
Puccinia sessilis is a fungal species and plant pathogen, which is also known as arum rust or ramsons rust.[3] It commonly infects Arum maculatum and Allium ursinum causing yellow to orange circular patches on leaves. On the underside of the leaves, it produces raised orange aecia commonly covered in spores. It is common in Eurasia in the spring.
A specialised form, Puccinia sessilis f.sp. narcissi-orchidacearumBoerema & Kesteren (now called Aecidium narcissi) is a cause of rust in daffodils (Narcissus) and also on various wild Orchidaceae species.[5]
^Boerema, G. H.; Hamers, Maria E. C. (May 1989). "Check-list for scientific names of common parasitic fungi. Series 3b: Fungi on bulbs: Amaryllidaceae and Iridaceae". Netherlands Journal of Plant Pathology. 95 (S3): 1–29. doi:10.1007/BF01981520. S2CID9422139.