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31-08-2025 17:32

Michel Hairaud Michel Hairaud

Bonjour, Pas d'identité trouvée pour cette réc

31-08-2025 19:41

Enrique Rubio Enrique Rubio

Hi to someone.I need to download this issue of Sve

31-08-2025 14:34

Thomas Flammer

I have found a Rutstroemia on abt. 2000 m on Alnus

29-08-2025 19:04

Thomas Flammer

Spores 21.2 - 26.2 x 8.3 - 11.3 µm - Q: 2.20 - 2.

30-08-2025 18:29

Joaquin Martin

Hi,I found this undetermined ascomycete on broadle

28-08-2025 17:24

Thomas Flammer

I know, that this is not the real topic of this fo

29-08-2025 05:16

Francois Guay Francois Guay

I think I may have found the teleomorph of Dendros

24-08-2025 21:59

Edmond POINTE Edmond POINTE

Bonsoir amis mycologues,Trouvé sur crottin de che

27-08-2025 12:02

Pavol Palo

Hello dear friendsI would like to ask for sharing

25-08-2025 17:37

François Freléchoux François Freléchoux

Bonjour,Nous avons trouvé samedi dernier à l'ét

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Hypoxylon rubiginosum??
Dartanha Soares, 24-04-2015 22:07
Dartanha SoaresDear all,

This week I found this fungus, which I believe be Hypoxylon rubiginosum "species complex", but I would like to hear some additional (expert) opinions.
In my opinion the fungus presented here is the same posted by Enrique Rubio (http://www.ascofrance.fr/search_forum/15884),
The fungus was found on dead twigs of Tabebuia sp., in Southeast Brazil.


Short Description:
Stroma dark brick-red to brown, 3 to 8 mm, sometime reaching 1 cm, with minute whitish dots (ostioles) below or at same level of the stromatal surface (Fig.1A-D); Ectal-excipulum textura prismatica (Fig.1H); Asci cylindrical up to 130 x 6-8 microns (Fig.1I-K); Ascopores periospores (Fig.1L-O) elliptical with on side flattened, 8.5-10 x 4-5 microns, with germ slit from end to end (Fig.1Q-S) and with almost inconspicous ring-like transverse ornamentation (Fig.1T).


Additional notes: This specimen reacted positively with MLZ (blue apical ring), without pre-treatment with KOH (Fig.1P). Orange pigments on paper with KOH 5% (Figs. 1E-F).


Any advise will be welcome.
Thank you very much.


Legend: A and B - superficial view of the stroma; C - transversal section of a stroma; D - laminar section of a stroma; E, F and G - pigments on KOH after 10 sec, 5 min, and 1:30 h, respectively; H - ectal-excipulum textura prismatica; I and J - asci on MLZ; K - young ascus on H2O; L, M, N and O - sheat release; P - blue apical ring in MLZ without pre-treatment with KOH; Q, R and S - germ slit; T - ring-like transverse ornamentation.

. Bars=10 microns, except A-G.
  • message #35404
Jacques Fournier, 25-04-2015 14:36
Jacques Fournier
Re : Hypoxylon rubiginosum??
Hi Dartanha,
Hypoxylon rubiginosum does not occur in tropics but it has many look-alikes. Based on the somewhat vinaceous tone of the stromata and the sigmoid germ slits I would go for H. fendleri Berk. ex Cooke but with some reservations.
Could you send it over at the following adress?

Jacques Fournier
Las Muros
F. 09420 Rimont

Thanks,
Jacques
Dartanha Soares, 27-04-2015 17:19
Dartanha Soares
Re : Hypoxylon rubiginosum??
Hi Jacques,

Thank you very much for your comment.
I sent a private email to you.

Dartanha