Pseudocerradoa paullula

Taxonomy

Family Pucciniaceae

Pseudocerradoa paullula (Syd. & P. Syd.) M. Ebinghaus & Dianese  

Synonym Puccinia paullula Syd. & P. Syd.

Description

Uredinia hypophyllous. Urediniospores globose, reddish brown in mass, honey colored when mounted, echinulate, 22.8–34.2 μm diam, epispore 1.5–2 μm wide. Urediniospores at first hyaline and formed on deciduous pedicels up to 47.6 μm long. Median urediniospore measurements 26.6–28.5μm. Teliospores two-celled, smooth, 22.8–32.2 x 19–30.4 μm, epispore 2–2.5 (–4) μm wide, septum vertical or oblique, on long hyaline pedicels up to 77.9 μm long and 3.8 μm wide near the base. 

Shaw, D.E. 1991. Rust of Monstera deliciosa in Australia. Mycol. Res. 95: 665–678.

Reported hosts

Monstera deliciosa. Symptoms were obtained with artificial inoculation on Epipremnum pinnatum, Monstera adansonii, M. standleyana, M. subpinnata.

Reported distribution

Reported distribution includes Australia, China, Japan, and the US (Florida, South Carolina). 

Unpublished distribution records based on MycoPortal and GenBank information include Malaysia, Papua New Guinea, Philippines, and Thailand. 

DNA sequences available

Vouchered GenBank accessions include:

KY764151 P. paullula voucher BPI 893085 from Malaysia

KX999886 P. paullua voucher BRIP 60018 from Australia

OQ275201 P. paullula voucher PIGH 17154 from Florida, USA

Comparison to other rusts on Monstera

taxon	shape	color	measurements (μm)
Pseudocerradoa paullula	globose	light yellow-brown	26.6–28.5
Uredo monsterae	ovoid to ellipsoid	hyaline	18–22 x 21–27
Uredo monstericola	ovoid to ellipsoid	hyaline	19–29 x 29–40

References

Ebinghaus M, et al. 2022. Reinstatement and phylogenetic allocation of the palm rust genus Cerradoa in the Pucciniaceae, and establishment of Pseudocerradoa, gen. nov. Mycologia 114.5: 868–886.

Shaw DE. 1991. Rust of Monstera deliciosa in Australia. Mycological Research 95.6: 665–678.

Shaw, DE. 1995. Reaction of aroids to Puccinia paullula f. sp. monsterae. Australasian Plant Pathology 24.1: 15–21.

Urbina H, et al. 2023. Detection of aroid leaf rust Pseudocerradoa paullula on Swiss cheese plant Monstera deliciosa in the continental USA. Plant Disease (in press).

Yang X, et al. 2023. First report of Pseudocerradoa paullula causing aroid leaf rust on Swiss cheese plant Monstera deliciosa in South Carolina, USA. Plant Disease (in press).

Yang XP, TieZhi L, and Jing L. 2020. Identification of the pathogen causing rust disease on Monstera deliciosa in Inner Mongolia. Acta Phytopathologica Sinica 50.3: 369–372.

Notes

Image credit: All images by Megan Romberg USDA-APHIS-PPQ-NIS