20 DECADES OF FUNGI. 
to the habit of other cortical Spkærie. It has, however, been submitted 
to several experienced Lichenologists, as Mr. Babington, Mr. Borrer, 
Professor Fries, and Dr. Montagne, without eliciting any satisfactory 
opinion, and I therefore think myself justified in considering it as a 
Spheria rather than a Verrucaria, especially as there is no crust. In 
some states it resembles very closely the genus Parmentaria, Fée. Ex- 
ternally it is not unlike SpA. turgida. The perithecia vary in number 
from 5 to 10, but are always laterally compressed, so that a section 
reminds one of the disposition of the carpels of an orange. 
309. Physarum iridescens, n. s. ; confertum, sessile vel spurie stipita- 
tum ; peridiis subglobosis columbino-chalybeis tenerrimis ; floccis albis, 
sporis atris. 
Has. On Jungermannie. Labassère, South of France. 
Crowded, either entirely sessile or spuriously stipitate ; peridia glo- 
bose or contracted at the base, from their crowded mode of growth, 
very delicate, reflecting prismatic colours like iridescent copper ; flocci 
irregular, branched, varying in thickness, white ; spores deep violet- 
black to the naked eye, but inclining to lilac under the compound 
microscope, globose when moist, elliptic, but pointed at either end 
when dry. 
Agreeing exactly in habit with P. bryophilum, but differing in its 
white flocci and darker spores, whose diameter is twice as great as in 
British specimens of that species. After a careful search I can find no 
intimation of the Pyrenean species. ; 
310. Agaricus (Psathyra) calvescens, n. s. ; pileo submembranaceo 
ex ovato conico-subcampanulato obtuso primitus piloso-tomentoso de- ~ 
mum calvescente ; stipite floccoso sursum glabro fistuloso; lamellis 
latis ascendentibus adnexis distantibus cinereis. Hook. fil., no. 117, 
eum ic. 
Has. On mossy earth, in tufts. Darjeeling, 7,500 feet. September. 
Odour like that of 4g. campestris. Soft, brittle. Pileus 14 inch 
across, at first ovate, white, with a pale reddish-yellow tinge, clothed 
with pilose fasciculate deflexed down, thin, conical, subcampanulate, gra- 
dually becoming smooth, even, cinereous, with the exception of the 
yellow apex. Stem 2 inches high, 2 lines thick, floccoso-squamose 
below, the tufts of flocci pointing upwards, smooth above the point 
of attachment of the edge of the young pileus, white, slightly in- 
crassated downwards, fistulose. Gills broad, ventricose, ascending, 
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