Observation 165436: Julella Fabre

When: 2014-05-09

Collection location: Jamor, Oeiras, Portugal [Click for map]

Who: zaca

No specimen available

When I found it I though this to be a Pyrenula sp., it has all that looking including “a coating” very difficult to photograph, since the photos always seem to be unfocused. So it was a surprise that when looking at the spores they appear to be muriform. But I was so “convinced” of it to be a Pyrenula that I search in the British Flora for species in that genus with muriform spores. Well, that even exist (just one), but it is rare and the spores are a lot bigger. Then I realise that in the microscopic observation I didn´t saw any alger layer. This point make me remind that I had observed in the past a pyrenocarpus with muriform spores: Julella vitrispora. This lead me to the search in the neighborhood for specimens of that species, which I found a week later when going back to the place of the observation. The result I posted already in observation 165386. Now I emphasize some of the features of this specimen and compare it with those of Julella vitrispora, as referred in the above cited observation:
1- Thallus: greyish covered by a network of whitish hyphae, like a tracery (the color is a bit darker then in J. vitrispora, which has a smooth thallus without a network having only similar hyphae at the places where perithecia emerge);
2- Chemistry: somewhat strange – C-, K+ yellow, KC+ yellow; the C reaction can be described as negative, though there were some blackning effect, the KC reaction just maintained the K reaction (all reactions negative in J. vitrispora);
3- Perithecia immersed when young and becoming only few immersed when mature (just like in J. vitrispora);
4- Involeucrum dark-brown; ascomatal wall dark brown to black, continuing to the bottom of the hamathecium (in _J. vitrispora the ascomatal wall is inexistent at the bottom of perithecia);
5- No alga was observed (just like in J. vitispora; the green layer in the photos seem to belong to the host);
- Asci clavate to almost cilindrical, 2 mature measured: 140 × 33 um and 118 × 31 um (seem bigger than in J. vitrispora, but too few measurements);
- Ascospores muriform, long ellipsoid with average dimensions: Me = 29.6 × 12.9 um ; Qe = 2.3 (N=52), in the ranges: 25.4-36.5 x 11.5-15.6 um (spores of the same form that in J. vitrispora, but slightly bigger (3 um in average) and wider (~1 um) than J. lactea; To refer that: (a) 50% of the measurements for the lenght are out of the range (being bigger) of J. vitrispora as given in CNALH (for _J. lactea), (b) 35% of the measurements for the width are out of the range (being wider) of J. vitrispora , as given in CNALH (for J. lactea).

Taking into account the above considerations I suppose to be in presence of a species of Julella different from J. vitrispora, but I was not able to find a candidate for the epithet.

Reference: CNALHhttp://lichenportal.org/portal/taxa/index.php?taxon=51825.

Edited on May 19, 2014
In the above text the species Julella lactea was substituted by Julella vitrispora as a consequence of the changes made at the same date in my previous observations of Julella specimens. See the Notes of observation 165386 for more details.


Chemical reactions;
Microscopy 1: Sections;
Microscopy 2: immersed perithecium;
Microscopy 3: Asci;
Microscopy 4: Spores.

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Data and microscopy added.
By: zaca
2014-05-18 16:57:31 CDT (-0400)

Created: 2014-05-17 19:56:14 CDT (-0400)
Last modified: 2014-05-19 20:09:12 CDT (-0400)
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