21-12-2025 09:32
Josep Torres
Hello.A tiny ascomycete found embedded in wood in
21-12-2025 21:32
Pol DebaenstHello, Garden, Burgweg 19, Veurne, BelgiumOn 10/1
22-12-2025 23:38
Patrice TANCHAUDBonsoir, récolte sur un mur en pierre, apothéci
22-12-2025 00:47
Patrice TANCHAUDBonsoir, récolte à proximité du milieu dunaire
21-12-2025 21:40
Isabelle CharissouBonjour, j'aimerais connaitre les références de
20-12-2025 23:08
Patrice TANCHAUDBonsoir, récolte sur sol sablonneux dans l'arriÃ
Small resin asco?
Mirek Gryc,
20-12-2025 10:49
Hi.
„I doubt it is possible to identify this tiny fungus with such limited data, but I have decided to post a few photos anyway. Unfortunately, I am unable to determine whether croziers are present or not. I observed a very faint apical reaction to iodine. No hairs were found. Marginal cells are essentially absent; if any exist, they are so hyaline that they are impossible to observe with my equipment.
Ascomata diameter: 0.1–0.2 mm. Substrate: old spruce resin.
I hope someone here has encountered something similar before."
Ascomata diameter: 0.1–0.2 mm. Substrate: old spruce resin.
I hope someone here has encountered something similar before."
Spores 3.8 - 4.5 × 1.9 - 2.05 (2.1) µm
Regards
Mirek
Mirek
Mirek Gryc,
20-12-2025 11:02
Re : Small resin asco?
Lugol
Hans-Otto Baral,
20-12-2025 17:53
Re : Small resin asco?
Hard to tell. A Ciliolarina perhaps? Does it have rough small hairs?
Mirek Gryc,
20-12-2025 18:26
Re : Small resin asco?
Dear Zotto,
The elements of this ascoma are so strongly hyaline that observation is extremely difficult. As you can see, the size is also a challenge. I tried staining, but I currently don't have any Congo Red. I couldn't see anything resembling hairs. There are several dozen fruitbodies on this resin; I have preserved them and will try again once I obtain some staining reagent. One thing I am certain of: this species is strictly resinicolous. I haven't seen a single fruitbody outside of the resin.
I have already searched your drive for the genus you suggested, but I couldn't find anything similar. The fruitbodies are mature, so these dimensions are definitely representative of the species. The spores immediately reminded me of Hyphodiscus hymeniophilus, but then again, nothing else fits that species. As soon as I saw them, I knew they would be problematic because I've never seen anything like them before.
Could it be some resinicolous Cistella?
Best regards,
Mirek
The elements of this ascoma are so strongly hyaline that observation is extremely difficult. As you can see, the size is also a challenge. I tried staining, but I currently don't have any Congo Red. I couldn't see anything resembling hairs. There are several dozen fruitbodies on this resin; I have preserved them and will try again once I obtain some staining reagent. One thing I am certain of: this species is strictly resinicolous. I haven't seen a single fruitbody outside of the resin.
I have already searched your drive for the genus you suggested, but I couldn't find anything similar. The fruitbodies are mature, so these dimensions are definitely representative of the species. The spores immediately reminded me of Hyphodiscus hymeniophilus, but then again, nothing else fits that species. As soon as I saw them, I knew they would be problematic because I've never seen anything like them before.
Could it be some resinicolous Cistella?
Best regards,
Mirek
Mirek Gryc,
23-12-2025 12:35
Re : Small resin asco?
„Hi Zotto,
I've looked through your drive again and found a very similar Ciliolarina collection: "Abies resin, synnemata". The morphology is very similar, but the spores appear slightly larger – at least according to my measurements based on the scale bar in the photos.
It seems to me that such fungi are not that rare on old resin. I've found similar specimens again, also on spruce resin, but at a site about 20 km away from the previous one. Initially, I thought it was the same species but more mature, however, the spore measurements contradict this. The current dimensions are approximately 8 × 3 µm. I observed a single septum in fully mature spores.
The hairs are slightly roughened, although this isn't clearly visible in the photos. The iodine reaction is positive, but not 'bb' (I didn't test it after KOH pretreatment). I find it difficult to judge whether these are typical croziers.
Best regards,
Mirek"
I've looked through your drive again and found a very similar Ciliolarina collection: "Abies resin, synnemata". The morphology is very similar, but the spores appear slightly larger – at least according to my measurements based on the scale bar in the photos.
It seems to me that such fungi are not that rare on old resin. I've found similar specimens again, also on spruce resin, but at a site about 20 km away from the previous one. Initially, I thought it was the same species but more mature, however, the spore measurements contradict this. The current dimensions are approximately 8 × 3 µm. I observed a single septum in fully mature spores.
The hairs are slightly roughened, although this isn't clearly visible in the photos. The iodine reaction is positive, but not 'bb' (I didn't test it after KOH pretreatment). I find it difficult to judge whether these are typical croziers.
Best regards,
Mirek"
Hans-Otto Baral,
23-12-2025 15:19
Re : Small resin asco?
I am now convinced that it is a Hyphodiscus, a very difficult genus. The warted hairs are clearly visible on your photo, and also the croziers are clear. You saw in my folder that there are several subfolders without an official name.