Collection location: Parque de Monsanto, Lisboa, Portugal [Click for map]
This was something out of my usual obervations and resulted to be a “double fungi”, i.e. a fungus that is present in two forms: anamorph and telemorph, that is sometimes referred as the holomorph. That fact only “de per si” is new to me.
Mainly due to historic reasons, the anamorph and the telemorph have different scientific names. Either of them are completely new to me and I’m still learning how to observe them under the microscope. The identification process is not yet complete, because the data obtained from microscopy doesn’t allow to do it.
These specimens were treated in a topic at AscoFrance:
where with the help of Martin Bemmann, the name proposed here was suggested and seeming to be the best choice: “Gibberella cf. zeae”. The anamorph of Gibberella zeae is commonly referred as Fusarium graninearum, but there seem to exist many synonyms of either of them, anamorph and telemorph versions (in a
future message I will mention some). Since then I have continued to make microscopy on the specimens, which are consitent with those obtained at the time of that post, but meanwhile I got new insights on the microstrutures, that I will display at this observation and that will be updated as long as I will have new data to add.
Giberella zeae is characterized, among other features, by the 3-septate spores; it happens that in my preliminary micro observations I could only see non-septate spores; after, with the help of cotton blue in latic acid, I could see many 1-septate spores and a single ascus where co-exist 1-, 2- and 3-septate spores (just one of this latter type, to be precise). Thus, at this stage I will not present specific photos of the spores and postpone for future updates to do it, hopping that, meanwhile, I can have some progress in this matter. On the other hand, I’m astonish with the beauty of the stuctures already observed and could not go further without giving notice of them. So, this observation will be a kind of “working in progress”.
I still had no possibilty of going back to the place of the observation to see if more specimens exist there, and maybe at a different maturation stage. I will try to do it
Let me now refer some other features of the species under observation:
- Ascomata growing on the wood of a living shrub – Coronilla minima (also identified by Martim Bemmann at the AscoFrance topic), having perithecia as fruiting bodies that grow in groups, but without forming a real stroma;
- The perithecia, which are very small (~ 200 microns) have the special property of being blue under transmited light, with a very rich wall structure;
- the hyphae around the perithecia are deeply divided and septate;
- the conidia, present in almost all part of the slides observed, are septate (mostly with 5 septa, but this is variable); in some of the observations, some tufts of conidia
were present in the neighbourwoods of the perithecia (bottom part of them);
- Within the perithecia, the hymenium consists of asci, appearing to be deeply guttulate both from the inside as well as from the outside, which makes it very difficult to observe them together with the spores inside, and chains of globose juxtaposed cells ending with a clavate or more or less cylindrical element;
All the above mentioned features are illustrated with photos attached to this observation.
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The following paper (available online) gives a description of Gibberella saubineti (a synonym for G. zeae) in both forms: anamorph (as “conidial stage”) and telemorph (as “Perithecial stage”):
Dimitr Atanasoff – Fusarium-blight (scab) of wheat and other cereals, Journal of Agricultural Research, Vol. 20 (no. 1), 1920.
There (page 16, Fig. 1) one can also see a picture of the conidia of Gibberella saubineti, which can be compared with my photos of the conidia.
Synonyms for “Gibberella zeae”
Botryosphaeria saubinetii (Mont.) Niessl, 1872 species
Dichomera saubinetii (Mont.) Cooke, 1878 species
Dothidea zeae (Schwein.) Schwein., 1832 species
Fusarium caricis Oudem., 1890 species
Fusarium graminearum Schwabe, 1839 species
Fusarium graminearum var. caricis (Oudem.) Wollenw., 1931 variety
Fusarium graminearum var. graminearum variety
Gibbera saubinetii Mont., 1856 species
Gibberella pulicaris subsp. saubinetii (Mont.) Sacc., 1878 subspecies
Gibberella roseum f. roseum form
Gibberella saubinetii (Mont.) Sacc., 1879 species
Gibberella saubinetii f. acuum Feltgen, 1901 form
Gibberella saubinetii f. saubinetii form
Gibberella saubinetii subsp. pachyspora Sacc., 1880 subspecies
Gibberella saubinetii subsp. saubinetii subspecies
Gibberella saubinetii var. acuum (Feltgen) Sacc., 1906 variety
Gibberella saubinetii var. acuum Feltgen variety
Gibberella saubinetii var. calami Henn., 1903 variety
Gibberella saubinetii var. coronillae Sacc., 1879 variety
Gibberella saubinetii var. flacca Wollenw., 1931 variety
Gibberella saubinetii var. mate Speg., 1908 variety
Gibberella saubinetii var. pachyspora Sacc., 1880 variety
Gibberella saubinetii var. saubinetii variety
Gibberella saubinetii var. tetraspora Feltgen, 1903 variety
Hendersoniopsis zeae (Schwein.) Woron., 1922 species
Sphaeria saubinetii Berk. & Broome, 1848 species
Sphaeria zeae Schwein., 1822 species