I was tempted to give to this specimen, as well as to that in observation 98495, the name Diploschistes muscorum, because is by far the best classification I can give based on the microscopic features: all the (complete) asci observed were 4-spored. However, I hesitated, because the habitat commonly cited for this species is soil and my speciemens grew on the pieces of rock of an old wall separating a road from the field. In addition, D. muscurom is referred to be a parasite of Cladonia spp. and I saw no evidence of these lichens at the specific place of the observation, though they exist on the wall. From the Diploschistes species cited in CNALH is the only one having only 4-spored asci. I only know other species with this characteristic – D. gypsaceus – but its thallus is densely white-pruinose (see lastdragon).
Here are some features of this specimen:
- Thallus whitish/greyish, epruinose;
- Apothecia black with a well developed rim, very small (up to 1mm), not completely open, slightly urceolate and pruinose at the margin;
- Asci with 4 spores each; spores muriform with up to 6 tranverse specta (commonly 5) and 2 longitudinal specta (commonly 1), first hialine but soon becoming brown, having the following dimensions:
18.9 [22.9 ; 24.6] 28.6 × 8 [9.6 ; 10.2] 11.9 µm
Q = 1.9 [2.3 ; 2.5] 2.9 ; N = 35 ; C = 95%
Me = 23.7 × 9.9 µm ; Qe = 2.4.
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Created: 2012-06-28 00:05:17 BST (+0100)
Last modified: 2012-06-28 00:12:27 BST (+0100)
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