Identification: Danish pastry

Discussion in 'Fungi, Lichens and Slime Molds' started by David Tang, Nov 17, 2018.

  1. David Tang

    David Tang Active Member

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    Found these on the bark of cherry blossom trees in Garry Point Park.
    They look some what different than those on my backyard pear tree.
    A fronds are much bigger. A lot of the "cups" don't look like "egg tarts",
    but like Danish pastry. Are these Xanthoria parietina ? and NOT X. polycarpa ?
    Or, the shape of the "cups" are not a diagnostic critera ?
     

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  2. Frog

    Frog Contributor Forums Moderator 10 Years

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    Hi David - I agree that Xanthoria parietina is the best match: Apothecia, appressed broad lobes, wood substrate, tendency to greenish-yellow tones, habitat, granular soredia not seen. Similar species differ in some of those characters. I have not used cup shape as a diagnostic character for this and similar X. species, so I don't know of a difference, but if you noticed a consistent difference there, then it could be a useful character.
     
  3. David Tang

    David Tang Active Member

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    Haha, just joking.
    I know it could be the struggle for available space that determines the
    shape of each cup.
     

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