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Seynesia (?) on Arundo donax
Enrique Rubio, 16-05-2016 15:43
Enrique RubioI'd like your opinion on this Seynesia (¿?) species growing on Arundo donax stems at the sea level, at the north of Spain.

The blackish, roundish, inmersed perithecia, single or in pairs, are more or less roundish, up to 1 mm in diam., beneath a thin clypeus. Only the papilla is visible on the peridermis of the host, but it is not surrounded by teeth-like flanges as described for Seynesia nobilis.

The 8-spored asci  have a wedge-shaped, amyloid, subapical apparatus. The living paraphyses are filled with a conspicuous, refractive, oily content that not dissapear in NH4OH. The ascospores are brownish at maturity, smooth-walled, two celled, constricted at the septum, with a full length germ slit in each cell, a thin mucilaginous sheath surrounding the ascospores and an obtuse or short cylindrical, not really conical, cap-like appendage at each pole of the spore.

I feel this species could be into the genus Seynesia, but I think it doesn't fit well with the somewhat known species of this genus (i.e. S. nobilis)

What is your opnion

Many thanks in advance

  • message #42735
  • message #42735
  • message #42735
  • message #42735
Jacques Fournier, 16-05-2016 16:15
Jacques Fournier
Re : Seynesia (?) on Arundo donax
Hola Enrique,
I was sure Arundo would give you nice suprises!
It's obviously a Seynesia and I find it fits fairly well in S. nobilis. Do you have Hyde's paper (1995) in Sydowia? He states that the teeth-like flanges around the clypeus are not always present, likely dependent on the texture of the host. Only the paraphyses with refractive content do not match.
I never encountered S. nobilis, thus I cannot discuss any more.


Enrique Rubio, 16-05-2016 16:23
Enrique Rubio
Re : Seynesia (?) on Arundo donax

Hi Jacques

Many thanks for your help and for advising me the study of Arundo