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Anthostomella ?
Garcia Susana,
13-07-2020 12:06
Hola,
Me gustaría saber vuestra opinión acerca de estos hongos.
Son peritecios inmersos, aislados o agrupados (2-3), con clípeo, creciendo sobre tallo de Scirpoides holoschoenus.
Microscopicamente presenta ascas octosporadas, con pie corto, de 80-110 x 12-18um, y aparado apical amiloide discoide.
Las paráfisis celulares, anchas (hasta 5.5um).
Las esporas asímetricas, he conseguido ver en algunas esporas una hendidura germinativa recta a todo lo largo de la espora, en su lado más plano.
Pienso que se trata de una especie de Anthostomella, pero no logro identificarla.
Gracias, saludos
Susana
Jacques Fournier,
14-07-2020 15:54
Re : Anthostomella ?
Dear Susana,
your images are excellent and leave no doubt it is an Anthostomella.
I used the key to worldwide species proposed by Lu & Hyde (2000) but I did not reach a satisfying match.
The point is that the spores do have a tiny cellular appendage, maybe two, that can be very easily overlooked. Anyway both options lead to a dead end.
The presence of a gelatinous sheath is also a discriminating character thay would be useful. Your last image suggests the presence of such a wide sheath winthin the ascus but it woukd be more informative to show the sheath surrounding free ascospores in India ink.
It's a difficult genus with species often just delimited by minor morphological differences. Also many undescribed species...
Cheers,
Jacques
Garcia Susana,
15-07-2020 23:47
Re : Anthostomella ?
Gracias Jacques,
Ya probé a teñir las esporas con nigrosina, y lo he vuelto a hacer, pero no veo que tengan vaina alrededor (o por lo menos no consigo distinguirla).
En cuanto a apendices tampoco observo ninguno. En algunas esporas veo una especie de apículos en el estremo.
¿Podrías enviarme el artículo que mencionas de Lu & Hyde (2000)?
Tendré que archivarla como Anthostomella sp.
Susana
Jacques Fournier,
17-07-2020 15:26
Re : Anthostomella ?
sorry Susana,
it is a big book nearly 400 pp and I don't have a pdf version. Maybe someone on the forum does...
Cheers,
Jacques
Garcia Susana,
17-07-2020 21:56
Re : Anthostomella ?
Ok, gracias de todos modos.
Susana