Phyllactinia guttata
| Phyllactinia guttata | |
|---|---|
| File:Phyllactinia guttata 1890.jpg | |
| Various stages in the life cycle of Phyllactinia guttata. Fig 1. Natural size, on chestnut leaf. 2. Perithecium enlarged. 3. Two asci. 4.Three sporidia. 5.Conidia-bearing hyphae. 6.Conidium germinating. | |
| Scientific classification Error creating thumbnail: | |
| Kingdom: | Fungi |
| Division: | Ascomycota |
| Class: | Leotiomycetes |
| Order: | Helotiales |
| Family: | Erysiphaceae |
| Genus: | Phyllactinia |
| Species: | P. guttata
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| Binomial name | |
| Phyllactinia guttata | |
| Synonyms[2] | |
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Phyllactinia guttata is a species of powdery mildew fungus in the family Erysiphaceae. A plant parasite, it infects the undersides of leaves of Corylus species (hazels).
Taxonomy
[edit | edit source]Originally named in 1801 as Sclerotium erysiphe by Christian Hendrik Persoon, the species went through a number of name changes in the 1800s. Salmon's 1900 monograph on the Erysiphaceae[3] established the name as Phyllactinia corylea for roughly half a century, until the starting date for the naming of fungi was moved, and the name was established as Phyllactinia guttata.[4]
Description
[edit | edit source]The mycelium may be abundant and persistent, or scant and short-lived (evanescent).[5] The cleistothecia can become large (216–245 μm), with soft wall tissue, and obscure cellular structure and cracks and wrinkles (reticulations).
The cleistothecia typically develop 8–12 easily detachable hyaline appendages that vary in length from 191–290 μm long. The asci are 4 to 5 to 20 or more, ovate, supported by small stalk-like structures (pedicellate), with dimensions of 72–83 by 32–40 μm. There are typically 2 spores per ascus, sometimes 3 or 4, and they are 31–36 by 21–25 μm.[6]
The cells attached to the upper part of the ascomata that resemble hairs are known as penicillate cells; they are made of foots and filaments. The filaments can gelatinize by absorbing water and are thought to function in helping the ascomata adhere to the surface on which they grow, like the underside of leaves.[7] In P. guttata, the foots are cylindrical, irregular in width, 32–72 by 7.5–25 μm, and divided into 2–10 branchlets in the upper part. Each branchlet is short, bulbous, with filaments being 20–42 μm, somewhat shorter than the foots, which are 2–4 μm wide. The short, bulbous branchlets on the multi-branched upper part of the foots are unique among the Phyllactinia and are a distinguishing taxonomic characteristic of this species.
Habitat and distribution
[edit | edit source]Phyllactinia guttula is distributed throughout temperate regions of the world.
P. guttata is a host for the fungicolous hyphomycete Cladosporium uredinicola.[8]
References
[edit | edit source]- ^ (Wallr.) Lév., Annls Sci. Nat., Bot., sér. 3 15: 144 (1851)
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