Rusts on Bolboschoenus (Cyperaceae)

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    This is a Pucciniaforming pockets elongated from where the spores emerge and released. I think Identification of Puccinia is somewhat host-related. I don't know if there is a website/database where one can input the host and get a set of possible plant pathogens.


    Spores


    (23.6) 24.7 - 32.1 (32.5) × (16.4) 17.2 - 19.8 (20.1) µm

    Q = (1.2) 1.25 - 1.8 (1.9) ; N=9

    V = (4018) 4518 - 5293 (5427) µm3

    Me = 27.1 × 18.6 µm ; Qe = 1.5 ; Ve = 4892 µm3


    and spore wall is almost 2 um thick!







    Well if you have some information to share with me about this species I will be glad.


    pilzforum.eu/attachment/426295/pilzforum.eu/attachment/426296/

    Hi Steve,


    it is definitely not P. striiformis. That does not fit in terms of colour of the uredia and it does not infect this host. On Bolboschoenus, there are two rusts: Uromyces lineolatus and Puccinia scirpi. They are distinguished most easily when teliospores are present: Uromyces has single-celled teliospores while Puccinia has two-celled teliospores. Unfortunately, here you only got uredospores. The uredospores of Uromyces lineolatus have three, more or less equatorial germ pores while those of Puccinia scirpi have two germ pores. Another hint can come from plants in the surroundings. U. lineolatus alternates between Bolboschoenus and Apiaceae like Apium, Daucus, Helosciadium, Oenanthe, Pastinaca, Sium, Torilis but also Glaux, Hippuris while P. scirpi alternates to Nymphoides.


    In terms of literature, you should check Klenke & Scholler (2015) which is the most up to date book on phytoparasitic fungi in central Europe (I know that Malta is not in central Europe, but they often mention fungi from the Mediterranean area). Apart from that, the old book by Gäumann (1959) is also always worth taking a look - you can find a free digitized version at the ETH Zürich.


    Björn

    Hello Bjorn! Thanks for the detailed reply and it was very helpful.


    Starting from the last, the book should be this one:


    Pflanzenparasitische Kleinpilze | SpringerLink

    Maybe I buy the e-book at half the price.


    Regards our rust, I scraped immediately my idea of P. striiformis and it is most likely to be Uromyces lineolatus. From the aspect of host ecology (life cycle) there are several Apiaceae in the surroundings (Daucus, Ferula and Phoeniculum) while there are no Nymphoides recorded in Malta (and cultivated chances has to be discarded as the locality is away from urban). I can mount some spores in glycerol solution and see if they germinate to have the 100% mark.


    The 1959 book is here (german text :( )


    https://swisscovery.slsp.ch/permalink/41SLSP_NETWORK/nan79r/cdi_eth_eperiodica_oai_agora_ch_cry_001_1959_12_1460


    THANKS

    Hi Steve,


    yes, you are right, the linked books are the ones that I referred to. However, I should emphasize that both are in German actually.


    If there is no Nymphoides around in Malta, identification becomes easy indeed. Concerning the germ pores, I don't think that you will be able to get the spores germinate in a mount (I have never seen this happening, and I look at a lot of rusts microscopically). Some mounting media like Hoyzer's medium might still make the germ pores visible more easily, but often you can already spot them quite easily when mounting spores in water (due to the large size and the three-dimensional nature of spores, it is often hard to judge germ pores on photos, but if you look and can focus through the spores, things get easier).


    Björn

    Thanks bjorne - I had my browser set to - automatic translate to english and the chapters of the book were showing in English on Springer website. Pity the book is in German. Wish it will get translated soon or later as it seems to be a great reference and unique book :( (maybe if I buy the pdf where I can copy text and get the text block translated in Google translate.... but not sure if the pdf let u to copy text to be pasted (sometimes they don't allow it for copyright)


    thanks

  • Steve_mt

    Hat den Titel des Themas von „Puccinia on Bolboschoenus (Cyperaceae)“ zu „Rusts on Bolboschoenus (Cyperaceae)“ geändert.