26-04-2024 10:07
Mathias HassHello, Does anyone know what this is? Found on J
24-04-2024 21:54
éric ROMEROBonjour, J'ai trouvé ce Lasiobolus sur laissées
23-04-2024 15:18
Lothar Krieglsteiner... but likely a basidiomycete. I hope it is o.k.
23-04-2024 13:17
Edouard EvangelistiBonjour à tous, Je viens de récolter ce que je
23-04-2024 21:49
Ethan CrensonHello all, A friend recently found this orange as
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Zuzana Sochorová (Egertová)Hello,I made a loan of a collection of Microstoma
11-01-2022 16:36
Jason KarakehianHi does anyone have a digital copy of Raitviir A (
22-04-2024 20:38
Miguel Ángel RibesGood afternoon.Does anyone know this anamorph?It g
However, on searching the forun for Nectria, there ar so many other mediterranean species sthat I came into doubt about my ID. Here is the data
Ascocarp morphology: Clustered ostiolate perithecia
Acocarp colour: Bright red, then blackening when old; purple-blue in KOH, orange-yellow in lactic acid
Ascocarp diameter: 0.16 – 0.32 mm (mean: 0.23 mm)
Ascocarp texture: Rough, Granulated or minutely tuberculate
Ascocarp shape: Spherical then pyriform, opening at the apex by a tiny narrow ostiole sometimes widening to a cupulate shape
Ascocarps sit on a common perithecial stroma, up to 1mm high
Paraphyses not numerous, filamentous, very thin and hyaline, inconspicuous and do not take the stain very well
Ascospore release through an apical orifice without an operculum
Asci: cylindrical to subclavate, slender, slightly bent ot curved, tapering gently towards the base.
No. of Spores 8
Tunic (Wall) Uni-tunicate, hyaline and do not stain well
Ascum length (range) 70 - 100 µm
Ascum length (mean) 84 µm
Ascum width (range) 6.8 - 7.5 µm
Ascum width (mean) 7.1 µm
Ascum L:W ratio 11.8
Iodine reaction (J +/J -) J-ve (but I'm not sure there is a blackish shadoe at the tip with IKI)
Orifice or ascum rim Rim slightly revolute, oriffice narrow, canal-like, surrounded by a thich asus wall.
Spore length: (range) 11.46 - 16 µm
Spore length: (mean) 13.7 µm
Spore width: (range) 4.76 - 7.44 µm
Spore width: (mean) 6.3 µm
Spore Q factor (range): 1.84 - 2.85 µm
Spore Q factor (mean): 2.2
Spore shape: Fusiform to navicular with a constriction at the central septum
Spore septa 1
Spore surface: Smooth or finely rugose when observed at high resolution with LACB
Oil bodies: Two, one at each side of the septum, often seen as a small amorphous body of many aggregates coalescing together until finally forming a distinct globular oil body.
Remarks Spore quite variable in size.
your fungus is not the genus Nectria but it could be an old specimen of Cosmospora s. l.
Regards,
Christian
Thanks
Your fungus as pyriform ascomata and seems fungicolous on your images.
Christian
Stroma inconspicous or absent [Not sure]. Perithecia scattered to gregarious[YES], pyriform with an acute or apical papilla[YES], collapsing cupulate or pinched when dry[YES], orange red or bright red [YES], turning dark red in KOH+[YES, but purple-violet], smooth walled [Maybe], usually 150–450 ?m high [YES]. Asci cylindrical to narrowly clavate[YES], with an apical ring [I think I've seen this sometimes, not sure], 8 uniseriate or partly biseriate ascospores [YES]. Ascospores initially hyaline but becoming yellow brown to reddish brown, 1-septate [YES], becoming tuberculate when mature [I think so].
Habitat: On fruiting bodies and stromata of other fungi, e.g.Fomitopsis, Hypoxylon, Inonotus, Stereum, often isolated from soil. [I'm not convinced]
I am not convinced that the perithecia are fungicolous and the black stroma-like bedding seems to be part of the nectriaceae species. Young individual perithecia seems to be growing directly from the stem, so I think we have a lignicolous species rather fungicolous. How can we confirm this???
Also what literature do you suggest on this topic?
Hope this give some more clues, and I would really appreciate your expert help.
Cheers,
Christian
Chirstian
I managed to grow colonies from the teleomorph producing white colonies
Follow here:
http://www.ascofrance.com/forum?page=1&id=49058
I think your fungus could be "Cosmospora' flavoviridis, which is not Cosmospora s. str.
Regards,
Christian
C. meliospicola: Distribution central Africa and North Africa - not european (but Malta is close to Africa!); spore size - OK; Spores smooth to slighlly spinulose - OK; On wood possibly fungicolous (OK-ish); anamorph Acremonium-like - I don't know
C. stilbosporae: Distribution Europe - OK; growing on Valsa sorbi - NO; ascospores (13- )13.5- 16.5{-18.5) x (5.5- )6-7(- 7.5) - a bit too large; anamorph Fusarium - I don't know.
C. flavoviridis (Sphaerostilbe flavoviridis): Anamorph colony greenish - mine where white, but yellowish on SDA (see image); Distribution North temperate (North Europe and UK) - maybe too north for Malta ? ; On stromatic ascomycetes on wood - YES.
(C. dingleyae: offers a good match but from New Zealand!)
Christian, may I ask why you would exclude C. meliospicola and 2) is my anamorph an Acromonium or Fusarium or Acromenoid-like Fusarium hmm....
Further info: http://www.mycodb.fr/fiche.php?genre=Cosmospora&espece=flavoviridis
Your anamorph doesn't correspond to C.meliopsicola (which is said to have unicellular, ellipsoid conidia).
You conidia are (at least?) 3-septate and are fusarium-like. The anamorph of C.flavoviride is reported to be F.melanochlorum which, according to Samuels, Rossman et al, is "yellow, becoming olivaceus with yellow-green pigment spreading on to the agar".
Hope that helps,
Nick
Many thanks for you help. If you need any of my photos high-res for any use, just let me know. As I see this is the first time this Cosmospora is reported on AscoFrance.
Great!
Related info:
https://www.dgfm-ev.de/publikationen/artikelsuche/ansaetze-zur-erfassung-der-taxonomischen-struktur-der-ascomycetengattung-cosmospora-und-ihrer-nebenfruchtformen/download