152 PROCEEDINGS: BOSTON SOCIETY NATURAL HISTORY. 
margin.” On the contrary, in the dried specimens observed by the 
writer the whole surface acquired the brownish tint equally, except 
the margin, which remained whitish or cream-colored. The hyme- 
nium rests upon a thick trama composed of interlacing uniform hyphae 
of small size, which appear to pass up through the subhymenium and 
mingle with the basidia in the form of slender branching paraphyses 
about 1.5 [i in diameter (pi. 18, fig. 2). No cystidia were found 
although certain bodies about the size of young basidia but with atten¬ 
uated apex were occasionally seen. The basidia are club-shaped and 
of large size,— 14.5 X 40 fi (pi. 18, fig. 2). The spores are very large 
(14 X 19 /i), globose, apiculate, with very granular contents and usu¬ 
ally a single large refractive globule (pi. 18, fig. 3). 
Michenera artocreas .— This fungus was first described by Berkeley 
& Curtis in “Cuban fungi,” (Journ. Linn. soc. London, vol. 10, p. 
333, 1869), on dead trunks of trees (black oak). Berkeley & Broome 
(’75) use the name Artocreas micheneri B. & C., and Massee in his 
“Thelephoreae” (’QO-’Ql) calls it Aleurodiscus micheneri. The 
species is not common, but has been reported from a considerable 
number of localities in the eastern United States, also from Cuba 
(Wright), upon species of Acer, Quercus, and Fraxinus. 
The fructification has the form of a cup, from 3 to 20 mm. in diame¬ 
ter with whitish or brownish tinted sides and projecting rim; in mature 
specimens this cup is nearly or quite filled with reddish brown spores 
which cohere in a compact mass that becomes hard and cracked when 
dry. These cups are solitary, grouped together, or even more or less 
completely fused (pi. 26, fig. 137). In a longitudinal section three 
distinct regions may be recognized (pi. 18, fig. 6): the sides and base 
of the cup composed of interlacing hyphae, the hymenium lining the 
whole interior, and the brown mass of mature spores which frequently 
fills the cup to the brim. The sides and base of the fructification are 
composed of small colorless branching hyphae, woven into a loose 
spongy tissue. Near the exterior the hyphae are faintly brownish 
tinted, and layers of the same color traversing the tissue of the cup 
show that in many cases the development has been by intermittent 
periods of growth. In the inner region this spongy tissue passes into 
a denser zone of a yellowish or brownish color, the subhymenium. 
From this zone arise the sporophores and paraphyses which compose 
the hymenium. The sporophores (pi. 18, fig. 8-9) are branching 
clusters of hyaline filaments of varying length, each branch bearing 
