The Botany of Iceland - 01.12.1932, Qupperneq 13

FUNGI OF ICELAND
461
Plowrightia ribesia
Leptospliaeria Ribis
on Ribes rubrum
Phoma ribicola
Phomopsis ribesia
Phoma Malvacei |
Hendersonia Ribis alpini /...
Diplodia Rubi................
Cytospora leucostoma.........
Comarosporium laburnicum
Rabenhorstia rudis
Coniothyrium Laburni
Phytophthora infestans |
Phoma solanicola ;...........
Fusarium Solani
Sphaerulina intermixta.......
I
Ribes alpinum
Rubus idaeus
Prunus padus
Cytisus laburnum
Solanum tuberosum
Lonicera sp.
I shall mention one more example of the recent immigration
of a Boletopsis, which, similarly to that of the above-mentioned fungi,
seems to liave taken place simultaneously with the introduction of
the plant with which its existence is intimately bound up. This is
Boletopsis liiteus. — In a small plantation in the birch copses near
Hallormsstaðir in E. Iceland, there is an area with 10—12 year
old Pinus montana. Here for the first and only time in Iceland I
found Boletopsis luteiis.1
Upon inquiry the forester who had laid out the plantation
informed rne that none of these pines had been planted, but were
all raised from imported seeds! In this case the most natural ex-
planation of the occurrence of the fungi would seem to be that the
spores were introduced with the seeds.
1 In IS j 0r n H alldórsson’s Grasnytiar 1783, Boletus (Boletopsis) luteus is
stated to be growing in Iceland. From here this statement has found its way into
Mohr’s Islandsk Naturhistorie, 1780, and finally, with a reference to tliese sources,
into Rostrup’s lists of Icelandic fungi. None of the numerous other botanists
who liave subsequently searclied for fungi in Iceland have, as far as I know, ever
seen any trace of this easiiy recognisable fungus. As moreover B. luteus forms
mycorrhiza with coniferous trees oniy, these early statements cannot possibly be
correct.