Accès membres

Mot de passe perdu? S'inscrire

23-06-2025 13:25

Enrique Rubio Enrique Rubio

I would like to hear your opinion on this Scutelli

23-06-2025 04:03

Francois Guay Francois Guay

Hi, I found this tiny sulfur yellow asco growing o

22-06-2025 13:52

DirkW DirkW

Dear friends,anyone out there with this paper?:DOU

26-05-2025 18:09

Henk Remijn

Good day,In a burned forest near Hulst on the bord

21-06-2025 22:27

David Chapados David Chapados

Hi,Is this a Calycina? C. herbarum?Growing on an h

20-06-2025 08:33

Josep Torres Josep Torres

Hello.Small, blackish, mucronated surface grains s

11-06-2025 16:26

Jason Karakehian Jason Karakehian

Hi everyone, I am looking for the following protol

18-06-2025 19:24

Bernard Declercq Bernard Declercq

Good evening,On Oenanthe aquatica we collected  a

17-06-2025 14:23

Josep Torres Josep Torres

Hello.A probable Hyaloscypha from last June 1st, s

« < 1 2 3 4 5 > »
Possible Hymenoscyphus caudatus or similar
B Shelbourne, 17-09-2024 02:12
B Shelbourne• Macro and habitat seems like Hymenoscyphus s.l.
• Supported by paraphyses, spores and ascus rings.
• The spores, excipulum, and substrate make me think H. s.s.
• Possibly H. caudatus, based on spores, asci, and macro.

Habitat: On petioles and veins of dead leaves of Salix cf. caprea, possibly on a Betula cf. pendula leaf too (no micro), leaves well decayed, on the top of leaf litter, at the edge of a pond, mixed deciduous woodland, Low Weald, England, mid-September, after rain.

Apothecia: Whitish-yellowish, very small, diameter < 1 mm, short stipitate, receptacle whitish, disc opaquer and more yellowish, eventually plano-convex, margin uneven, relatively indistinct.

Asci: Mature and turgid ~110-125 x 8.5-10 um, cylindrical-clavate, 8-spored, biseriate when turgid, simple septa, rings bb, Hymenoscyphus-type, apex acute-truncate, thickening noticeable when flaccid, collar-like opening.

Spores: Scutuloid, quite variable, constricted in the middle, poles rounded, many smallish LBs in each half, most appearing to coalesce into 1-3 of medium size (in each half), uninucleate and aseptate.

Free spores in water: (13.8) 15.4 - 18.7 (19.3) × (4.2) 4.4 - 5.3 µm, Q = (2.7) 3.1 - 3.7 (4.4), n = 30, mean = 16.6 × 4.8 µm , Q mean = 3.5.

Paraphyses: Narrow cylindrical, ~2-4 um wide, multi-septate, rarely branching towards the apex, Hymenoscyphus-type VBs (apex with many medium-size, globose, dextrinoid VBs), pale yellow/chlorinaceous.

Medullary ex: Possibly textura porrecta (not tangled enough for intricata?), hyaline.

Ectal ex: Textura prismatica, hyaline.
  • message #80174
  • message #80174
Hans-Otto Baral, 17-09-2024 09:37
Hans-Otto Baral
Re : Possible Hymenoscyphus caudatus or similar
Yes, this is H. caudatus. My assumtpion is that there is some heterogeneity within this species, but it is hard to find a limit among the observed variation ind spore shape and content, amd pataphysis content. Only in the rare case when the asci have croziers I am sure it is something else.
B Shelbourne, 17-09-2024 11:09
B Shelbourne
Re : Possible Hymenoscyphus caudatus or similar
Thank you.

I can imagine this is challenging as I found even distinguishing this species quite hard at first, and I noticed some variance in the spore measurements given. However, Declercq's unpublished key does seem to get me there, once I worked out it is in table 2 (low refractive VBs, usually not reddening, folicolous).


Declercq also describes var. constrictus, with small apos, spores with rounded bases, and no reddening with trauma, which seems to fit my observation. There are sequences available for several samples labelled as H. caudatus, do you know if these support heterogeneity or any subgroups?

Hans-Otto Baral, 17-09-2024 12:19
Hans-Otto Baral
Re : Possible Hymenoscyphus caudatus or similar
Specimens with constricted, rather broad spores I also often encountered. The differences to species such as H. fructigenus (on Quercus fruits) or H. suspectus (on grasses) are hard to draw, however.
There are some Chinese sequences under H. caudatus that seem to be related but not identical, but these are very far from my HB 7588c (KM114539) which matches by 0.2% MZ492984 Hymenoscyphus caudatus strain FeF217 from Poland and is a bit more distant to MZ492985 Hymenoscyphus caudatus strain FeF416.
Disturbing is a sequence that is 100% = FeF217, but uploaded as H. albidus:
JX976998 Hymenoscyphus albidus isolate Ha_10203_(VS) (Gherghel et al. 2012 unpubl., 2010 K.H. Rexer, Fraxinus exc.). Clearly this is far from true H. albidus.

The upload of 7588c was not done by me, it lacks collection data: Tübingen, on Fagus cupules. Spores are slghtly constricted, rather broad. A docu is in my caudatus folder.