PERICH.«NA.] ARCYRIACE/E. 
thickly encrusted with numerous round, cangular, or rod-shaped 
bodies, only very partially consisting of lime, the upper part 
marked on the inside with delicate bands forming a regular 
reticulation with 5 to 6 angled meshes, 12 ^ diam. CapiUitium 
scarcely evident, consisting of few weak, simple, or branched 
yellowish threads 1-5 to 2 /a diam., unequally warted. Spores 
golden-yellow, delicately warted, 12 to 14 /x diam. 
Hah. On beech bark.— Denmark. 
This description appHes perfectly to forms of P. popiilim with 
scanty capillitium. 
9. P. nitens Kaunk., I.e., p. 55. Sporangia solitary or 
clustered, globose-pyriform, sessile or shortly stipitate, dehiscing 
irregularly, greyish-brown with a violet metallic lustre, 0-5 mm. 
diam. ; wall single, almost without deposits of granules. Capilli- 
tium of long weak threads, sUghtly branched, attached to the 
sporangium-wall by irregular enlargements, unequally and 
deHcately spinulose, of equal breadth throughout, 1 to 1'5 /a 
diam. Spores dehcately spinulose, yellowish, 10 to 12 /x diam. 
This description suggests a small-spored form of P. populina. 
10. P. Krupii Eacib., in Hedw., xxviii., p. 124 (1889). 
Sporangia chestnut-brown, rarely globose, depressed, solitary, 
usually flat creeping plasmodiocarps, irregularly ring-shaped or 
vermiform, 0'5 to 1'2 mm. long, plasmodiocarps as much as 
15 mm. in length, 0'5 to 0"75 mm. high; sporangium-wall simple, 
iridescent, chestnut-brown, finely warted, breaking away as a 
lid in the upper part. Capillitium forming a dense web of rather 
thick-walled threads, 0'3 to 1'5 /a diam., covered with crowded 
irregularly shaped, wart-like thickenings giving a toothed 
appearance, without constrictions, rarely branching ; capillitium 
connected with the sporangium-wall, by many thin smooth 
connecting threads. Besides these there are small, short or 
long outgrowths fi'om the sporangium-wall 2 to 12 long, 1 to 
3 /X thick, 200 to 500 on a square millimetre of the wall. 
Spores globose, brownish-yellow, minutely warted, 7 to 8*5 /a diam. 
Hob. On bark. — Tatra Mounts, Poland. 
This description suggests a species of Dianema, possibly D. corticatum. 
11. P. ? pseudsecidium Speg., in Ann. Soc. Cient. Argent., 
xxii., p. 187 (1886). Sporangia cylindrical, conical, or calyciform, 
1 to 1-5 mm. long, 0'5 to 1 mm. broad, sessile or shortly stipitate, 
wall very thin cartilagino-membranaceous, base even or minutely 
rugulose, dehiscing at the apex in an irregularly laciniate or 
fimbriate manner, chestnut or brownish ; mass of spores and 
capillitium citron or yellowish ; capillitium threads very slender, 
1 /X thick, sparingly branched here and there with solitary 
conical or elongated branch-like spines, yellowish ; hyaline. Spores 
