Lynge B 1928. Lichens from Novaya Zemlya. In Holtedahl O. Report of the Scientific Results of the Norwegian Expedition to Novaya Zemlya 1921. Oslo. 1-299.
Two plants, found on chalky rocks.
Thallus endolithic.
Perithecia small, diam. 0.2-9.3 mm, ca. prominent upper 3rd above substrate. Excipulum sooty black. Spores (24-) 26-33 (-37) X 10-16 µ.
Nucleus J bluish wine.
The perithecia leave pits in the chalk, a little larger than themselves (0.3-0.4 mm. in diam.), when they are shed.
As far as I can see the first mentioned plant is quite typical and VAINIO has acknowledged the determination. In the other plant there are but a few perithecia. The pits are larger, the spores 24-36 X 10.5-12 µ. Verrucaria integra has considerably larger perithecia: 0.2-0.5 mm, which are immersed in the substratum.
I referred some Bear Island plants to Verrucaria deversa VAIN.Lichen. Fenn. I (1921) pag. 49, on the reason that their spores were supposed to be too small for Verrucaria devergens.I measured 21-24(-30) X 12-15 µ.In his clavis VAINIO has distinguished these two species by their spore size; in the former: 15-20(-24) X 7-10, in the latter 30-36 X 11-18 µ.It seems to me that the above measures combined with my measures in Lich. Bear Island pag. 9 (21-24 (-29) X 12-15) bridge over these differences.We might refer the deversa to Verrucaria devergens as Verrucaria devergens var. deversa (VAIN.) LYNGE as a form with smaller spores.