EXOTIC FUNGI IN THE ROYAL HERBARIUM, KEW. 
3 
young specimens, which are usually more or less circular in out- 
line. The ridges sometimes become more or less broken up into 
detached, short, tooth-like portions, still evidently arranged in 
lines and forming reticulations. This latter arrangement of the 
plates in all probability suggested to Berkeley and Broome the 
genus Radulum , from which the present genus is at once dis- 
tinguished by having the entire surface of the hymenium, as well 
as the sides of the vertical plates, densely covered with stout, rigid, 
conical, colourless cystidia, that became incrusted with small, 
glistening crystals of oxalate of lime, exactly as in the genus 
Peniophora. The last-named genus differs in having the 
hymenium perfectly even. Basidia tetrasporous ; spores colour- 
less, continuous. 
Thwaitesiella mirabilis, Mass. 
Broadly effused, closely adnate and inseparable from the matrix, 
at first usually more or less orbicular, but the patches eventually 
grow into each other, thin, margin determinate ; hymenium 
minutely velvety from the numerous projecting cystidia, plates 
very thin, 1-2 m.m. high, forming irregular pits from 2-4 m.m. in 
diameter ; spores elliptical, ends obtuse, smooth, colourless, 9x5 
p . ; cystidia numerous, fusiform, the portion projecting above the 
level of the hymenium conical, and measuring 50-60 X 12-6 //,, 
colourless and rough at the apex, with minute particles of oxalate 
of lime. Whole fungus whitish when fresh, pale tan when dry. 
lladulum mirabile , B. 8f Br. Journ. Linn. Soc. Vol. XIV., p. 61 j Sacc. 
Syll.y Vol. vi., No. 6940. 
On decayed wood. Ceylon. ( Thwaites .) 
Patches 1-3 in. across, when confluent often extending for 
several inches. 
PI. 182, Fig. 8, fungus nat. size ; Fig. 9, portion of hymenium 
showing a basidium and a cystidium, x 400. 
Geastex involutus, Mass. 
Exoperidium divided nearly to the base into 6-8 subequal, acute 
segments that become strongly incurved when dry, externally 
brown and scurfy, inside smooth and pale grey ; endoperidium 
globose, slightly depressed, with an indistinct pedicel or sessile, 
pale yellowish tan ; peristome conical, elongated, strongly grooved ; 
capillitium threads usually simple, elongated, tips acute, almost 
colourless ; spores globose, minutely warted, brown, about 4 p 
diameter. 
On the ground. St. Domingo, W. Indies. 
Exoperidium about 2 c.m. across when expanded, the segments 
strongly incurved and rigid when dry. Allied to Geaster striatulus, 
Kalchbr., but distinguished by the pale inside of the exoperidium 
and the depressed endoperidium. 
Cyathus Baileyi, Mass. 
Peridium obconic or campanulate, at maturity widely open 
above, and with the margin slightly revolute, thin, and carti- 
