When: 2017-04-30

Collection location: Serra de São Mamede, Portugal [Click for map]

Who: zaca

No specimen available

Notes:
Lichenicolous fungus growing on Ochrolechia parella.
Ochrolechia parella is a very common lichen here. In the past I found several lichenicolous fungi living on it, but I didn’t succeeded to identify one with confidence. Some of them were very similar to the present one, particularly those in Observation 241307 and Observation 238445.
Looking for information about lichenicolous fungi on Ochrolechia I found Ref. 1, that has a key to the species in the genus that I found to be probable for this fungus: Sphaerellothecium -, after a search at http://www.lichenicolous.net/
The species S. araneosum results from the key, after the following steps:

1’ Infected parts of thallus not entirely blackish …………………………………………… 2
2’ Vegetative mycelium dark brown, macroscopically visible ………………………….. 5
5’ Ascomata developing on the host thallus; vegetative hyphae forming a distinct,
more or less superficial net ……………………………………………………………………… 7
7’ Not on Buellia …………………………………………………………………………………… 8
8 Ascospores 1-3(-5)-septate …………………………………………………………………… 9
9 Ascospores 1-3-septate, hyaline, then dark brown,
(12.5-)13.5-17(-22) × (3.5-)5-7(-7.5) µm; ascomata 40-100 µm diam.;
on Ochrolechia, Pertusaria and Varicellaria ………………………………… S. araneosum (Arnold) Zopf

Images

Microscopy: Apothecial sections of the host with ascomas of the fungus (x100, in water);
Microscopy: A thin section of the host with two immature ascomas of the fungus (x100&x400, in water);
Microscopy: The reaction to KOH on section (x400);
Microscopy: Asci and paraphysoids (x400, in KOH);
Microscopy: Asci and spores (x1000, in KOH).

Proposed Names

-29% (1)
Recognized by sight: Fruit bodies are apothecia and not perithecia as I wrongly thought!
Used references: Ref. 1: PAUL DIEDERICH & MIKHAIL P. ZHURBENKO, Sphaerellothecium phaeorrhizae and Zwackhiomyces sipmanii spp. nov. on Phaeorrhiza sareptana from north-eastern Asia, with a key to the species of Sphaerellothecium, Bibliotheca Lichenologica 99: 113-122, 2009.
Ref. 2: http://www.lichenicolous.net/
Based on microscopic features
58% (1)
Recognized by sight: My acknowledgment to Javier Etayo, who suggested this classification.
Based on microscopic features

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= Observer’s choice
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Created: 2017-05-01 12:53:59 PDT (-0700)
Last modified: 2017-05-01 14:32:26 PDT (-0700)
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