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28-04-2026 20:07

Lothar Krieglsteiner Lothar Krieglsteiner

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Ethan Crenson

Hi all, A few weeks back a friend pointed out som

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Vitus Schäfftlein

Hello, I found Trochila ilicina on Ilex aquifoliu

30-04-2026 10:43

Castillo Joseba Castillo Joseba

Me mandan el material seco de Galicia, España, 

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Rot Bojan

Hello, by appearance I would say that I am dealing

27-04-2026 18:48

Tony Moverley

Collected 23rd April 2026, Norfolk, EnglandSwarms

27-04-2026 20:52

Lothar Krieglsteiner Lothar Krieglsteiner

Found on hanging tiwg of Olea europaea in dried-ou

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Bernard CLESSE Bernard CLESSE

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29-04-2026 08:01

Lothar Krieglsteiner Lothar Krieglsteiner

... on twig attached to small tree of Citrus auran

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Lothar Krieglsteiner Lothar Krieglsteiner

growing at moist, drying-out soil at the side of a

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Paraphyses IKI reaction in Scutellinia
Perz Piotr, 03-02-2007 23:10
Hi,

I have question about paraphyses IKI reaction in genus Scutellinia. Sometimes paraphyses stain in IKI green - it means they have carotenoids. Sometimes there is no IKI reaction - also paraphyses does not contains carotenoids.

How is the name for violet-lila reaction? Here paraphyses of Scutellinia pseudotrechispora (Schröt.) Le Gal in IKI

  • message #1406
NC NC, 04-02-2007 10:10
Re:Paraphyses IKI reaction in Scutellinia
Bonjour,
J'ai déjà observé cette réaction violette avec le Lugol par exemple avec Scutellinia crucipila. Je pense que la réaction (carotene à l'extrémité des paraphyses)en vert foncé (vert-bouteille) s'arrete par manque de concentration en iode (??) et le mélange orange + vert foncé donne cette couleur lilas. Dans ton cas une préparation sans eau, seulement avec IKI donne t-elle toujours du violet?
Amicalement
Robert
Hans-Otto Baral, 04-02-2007 11:54
Hans-Otto Baral
Re:Paraphyses IKI reaction in Scutellinia
I have actually observed the same in "Scutellinia sp." (see my paper on Lugol versus Melzer, mycotaxon 29: 428, 1987): when adding IKI (Lugol) to a water mount, the colour reaction of the paraphyses changes from greyish-violet to grey.olive or grey-brown. The violet reaction is seen at an iodine concentration of 0.05-0.1% while the olive appears at 0.1-0.2 % and higher. So the colour is concentration-dependent similar as in the hemiamyloid apical rings. But contrary to hemiamyloidity, the violet and olive are also seen when KOH-pretreated, and I believe also in Melzer.

Zotto
Perz Piotr, 11-02-2007 09:00
Re:Paraphyses IKI reaction in Scutellinia
Thanks a lot, Robert & Zotto!