Observation 177038: Byssoloma leucoblepharum (Nyl.) Vainio
When: 2014-04-20
Who: zaca
No herbarium specimen

Notes: Seems the non-sorediate version of the one in observation 177035 with the same type of spores.

All chemical reactions negative.

Images

451945
451946
451947
Microscopy: Hymenium (x100);
451948
Microscopy: (Piece of the )Hymenium;
451949
Microscopy: Ascum with spores (only 4 instead of the common 8);
452379
Apothecia under the microscope (x25).
452380
Melzer reaction.

Proposed Names

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Recognized by sight
45% (2)
Recognized by sight

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Eye3 = Observer’s choice
Eyes3 = Current consensus

Comments

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As far as I could understand …
By: zaca
2014-09-12 17:11:54 PDT (-0700)

Byssoloma meadii is a North American species, thus not existing here. On the other hand, the British Flora describes B. leucoblepharum as having “Apothecia 0.3-0.5 mm diam., flat or sgightly convex, sometimes clustered on groups and becoming +- distorted, disk orange-brown to dark brown, sometimes with a bluish tinge, with a tomentose arachnoid margin, yelowish white to yelowish grey. Ascospores 10-18 × 2.5-4 um”. Also observe that B. subdiscordans is very similar (the only difference for B. leucoblepharum I saw in the description is that the arachnoid margin of apothecia is white or whitish grey) but usually lives on rock or on Ulex and Colluna stems. Thus I think that B. leucoblepharum is the species of my specimens.

Or the lamps were poorly made!
By: Jason Hollinger (jason)
2014-09-06 15:44:50 PDT (-0700)
Do not blame yourself,
By: zaca
2014-09-06 15:39:43 PDT (-0700)

in the case it was my fault.

Yeah, alas, I know all too well
By: Jason Hollinger (jason)
2014-09-06 15:32:09 PDT (-0700)

I still feel bad about that UV lamp fiasco.

Andrew had the same experience. I even sent him a lamp which I had tested and worked for me… and it still didn’t work(!)

Sorry, no UV light available.
By: zaca
2014-09-06 15:07:32 PDT (-0700)
Problem with meadii vs leucoblepharum
By: Jason Hollinger (jason)
2014-09-06 15:03:54 PDT (-0700)

leucoblepharum is supposed to have light-colored apothecia, but it turns out apothecia color is variable, so that’s no longer considered a good character. Instead you need to do the UV test (meadii is UV+ orange in the thallus, but you have to test it in a very dark room, it can be spotty and weak). So, Sharnoff’s photo looks like typical meadii, but there’s no way to rule out leucoblepharum without the UV test.

My specimen ressembles very much …
By: zaca
2014-09-06 14:59:25 PDT (-0700)

the one in S. Sharnoff gallery, classified there as “Byssoloma meadii
(or possibly Byssoloma leucoblepharum ?)”.

Looks good
By: Jason Hollinger (jason)
2014-09-06 14:48:43 PDT (-0700)
The melzer reaction also seems to agree …
By: zaca
2014-09-06 14:38:36 PDT (-0700)

with Byssoloma (see the new attached photo).

Oops!
By: Jason Hollinger (jason)
2014-09-06 14:26:34 PDT (-0700)

Funny, most of my specimens are on Ilex. I didn’t even notice the difference. I just assumed you’d written “Ilex”!

Ulex, not Ilex!
By: zaca
2014-09-06 14:22:29 PDT (-0700)
Quercus might be okay
By: Jason Hollinger (jason)
2014-09-06 14:16:02 PDT (-0700)

In eastern North America, the common “northern” Byssoloma species (i.e., the ones which can be found north of the tropics, but which may also be found commonly in tropics) can be found on all kinds of hardwoods, not just Ilex.

I think you in the right way concerning …
By: zaca
2014-09-06 14:00:22 PDT (-0700)

either this as well as observation 177039, as far as I could understand reading the description for Byssoloma in the British Flora. Concerning your question about the margin of apothecia, I waked up my old broken microscope which has a light above the sample, and took some (necessarily) bad photos, which show that the margin is fibrous or has an aracnoide network of hyphae, as the British Flora uses in the key for the genus (see the new attached photo). However, from the two species with such feature, B. leucoblepharum and B. subdiscordans, it seems to me that my specimen is closer to the description of the latter, but such species usually lives on rock or on Ulex or Calluna stems whereas my specimens lived on the bark of Quercus coccifera.

Bears strong superficial resemblance to Byssoloma
By: Jason Hollinger (jason)
2014-09-06 09:49:21 PDT (-0700)

Spores look right, too. Does the margin look fibrous and ecorticate up close? I can’t quite tell one way or another from the photos. Don’t remember if Byssoloma is a trentepohlioid genus…

Created: 2014-09-05 14:43:02 PDT (-0700)
Last modified: 2014-09-12 17:12:20 PDT (-0700)
Viewed: 72 times, last viewed: 2016-05-15 08:55:42 PDT (-0700)
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