Lachnum patulum or bicolor?

[SheffieldLass]

Just doing a catch up of ones found earlier this year. This was found in June on an oak leaf. Ellis & Ellis takes me to Lachnum patulum (well Dasyscyphus patulum), though the spores are narrower than quoted. They do wonder whether D patulum is the same thing as D bicolor. The spore size of mine fits D bicolor better.
(6.2) 6.6-7.9 (8.1) x (1.0) 1.2-2.0 (2.3)um Q av 4.6



The paraphyses were much longer than the asci, and lance shaped, and spores cylindrical, and pointed at one end, so certainly a Lachnum.

So L patulum or L bicolor?

Thanks
Melanie

[Ditiola]

Hi Melanie

Is this any help:

Hymenium yellow to orange; outside and hairs white.
Hairs very thick-walled, 175-250 x 4-5 µm, cylindric, hyaline, with
apical crystals. Frb short stipitate; apothecia 0.5 mm broad; Sp 6.5-9 x 2-2.5 µm, fusoid to cavate, aseptate; asci 32-40 x 5-5.5 µm; paraphyses lanceolate, 4 µm broad, 10 µm exceeding the asci. — On leaves of Quercus and cupules of
Fagus
L. patulum (Pers. : Fr.) Rehm


Hymenium orange, strongly contrasting the white outside and hairs; frb
short stipitate; apothecia 1-1.5 mm broad. Sp 6-10 x 1-2 µm , fusoid,
aseptate; asci 45-55 x 5 um; paraphyses lanceolate, 4-5 µm broad, 10-15
µm exceeding the asci; hairs 130-200 x 4-6 µm, cylindric, somewhat
thick-walled, hyaline, with apical crystals. — On deciduous twigs.
L. bicolor (Bull. : Fr.) P. Karst.

[Chris Yeates]

hi

any chance of more photo's Melanie? useful to see a section, what the hairs are like, spore guttulations, whether it has croziers etc.

there are outside candidates for further species it could be as well; not sure that L. bicolor is foliicolous . . .

Chris

[SheffieldLass]

a few micro photos:



Melanie

ER hmmm ... croziers and my other recent post? .... Two Hymenoscyphus species on beech mast

[SheffieldLass]

Just looking at this one again. Any more thoughts on it?

Melanie

[mollisia]

Hello Melanie,

definetely yes.

First, those carotinoid containing "Dasyscyphus" species with yellow disc are now in the genera Lachnellula (hairs without cristal head, on conifers only) and Capitotricha (hairs with cristal head, "never" on conifers).

So you have a member of the genus Capitotricha here.
Usually we have in Europe the following 4 species:
C. bicolor ss.str.: Spores 8-13 x 2-2,5(3) µm, without croziers, ubiquistic on all decidous wood.
C. rubi: Spores 6-11 x 1,5-2 µm, without croziers, on dead canes of Rubus idaeus.
C. fagiseda: Spores 10-15(18) x 2,5-3,2 µm, without croziers, on small twigs and cupules of Fagus.
C. patula: Spores 7-11 x 2-3 µm, WITH (!) croziers, on leaves of Quercus.

BARAL lists two undescribed species from grasses and Phragmites, deiffering besides the substrate in spores with high oil content.

The given spore sizes are always from living spores. For dead spores one can take sizes appr. 20% less then given above.

So yours certainly is Capitotricha patula.

best regards,
Andreas

[SheffieldLass]

Thank you very much Andreas.

Melanie