HABITATS. 235 
Of special habitats, we may allude to Myctalis, of which 
the species are parasitic on dead fungi belonging to the genus 
Russula. One or two species of Agaricus, such as Agaricus 
tuberosus and Agaricus racemosus, P., grow on decaying 
Agarics, whilst Agaricus Loveianus flourishes on Agaricus 
nebularis even before it is thoroughly decayed. A few specics 
grow on dead fir cones, others on old ferns, &ce. Ayaricus 
cepestipes, Sow., probably of exotic origin, grows on old tan in 
hothouses. Agaricus caulicinalis, Bull, flourishes on old thatch, 
as well as twigs, &e. Agaricus juncicola, Fr., affects dead 
rushes in boggy places, whilst Agaricus affricatus, Fr., and 
Agaricus sphagnicola, B., are attached to bog moss in similar 
localities. Some few species are almost confined to the stems of 
herbaceous plants. Agaricus petasatus, Fr., Agaricus cucumis, P., 
and Pasillus panuoides, ¥., have a preference for sawdust. 
Agaricus carpophilus, Fr., and Agaricus balaninus, P., have a 
predilection for beech mast. Agaricus urticecola, B. and Br., 
seems to confine itself to nettle roots. Coprinus radians, Fr., 
makes its appearance on plaster walls, Coprinus domesticus, Fr., 
on damp carpets. The only epizoic species, according to M. 
Fries, is Agaricus cerussatus v. nauseosus, which has been met 
with in Russia on the carcase of a wolf; this, however, might 
have been accidental. Persoon described Agaricus Neapolitanus, 
which was found growing on coffee-grounds at Naples; and 
more recently Viviani has described another species, dgaricus 
Coffee, with rose-coloured spores, found on old fermenting coffee- 
grounds at Genoa.* Tratinnick figures a species named Aga- 
ricus Markit, which was found in wine casks in Austria. A 
Coprinus has, both in this country and on the Continent, been 
found, after a very short time, on the dressing of wounds, where 
there has been no neglect. A curious case of this kind, which 
at the time excited great interest, occurred some fifty years since 
at St. George’s Hospital. Some species appear to confine them- 
selves to particular trees, some to come up by preference on soil 
in garden pots. Certain species have a solitary, others a gre- 
garious habit, and, of the latter, Agaricus grammopodius, Bull, 
* Viviani, ‘‘I Funghi d'Italia,” 
