108 
Mycologia 
Cooke 9 when he stated in referring to Boudiera, “in some re- 
spects allied also to Sphacrosoma.” 
Several of the points raised in the present paper are purposely 
left open with the hope that additional material collected in the 
field will help to settle some of the questions which are here only 
suggested. 
Conclusions 
The spores of Sphacrosoma fuscescens Klotzsch, type of the 
genus Sphacrosoma, are reticulate and not echinulate as concluded 
by Professor Setchell. Ruhlandiella hesperia Setchell is then a 
true Sphacrosoma and closely resembles the type species. 
Sphacrosoma echinulatum Seaver is a plant closely resembling 
Boudiera areolata Cooke & Phill. and is probably only an Ameri- 
can form of that species and not a true Sphacrosoma at all. 
Boudiera as represented by B. areolata is a genus closely allied 
to Lamprospora on the one hand and showing at least a superficial 
resemblance to Sphaerosoma on the other, a fact which was noted 
by Cooke, the author of the genus. Whether this resemblance 
is any indication of natural relationship is a question. 
The unnamed plant collected by Dr. Thaxter in Maine, although 
showing some dififerences in gross characters, closely resembles in 
microscopic details Sphacrosoma echinulatum of the writer and 
both are, so far as I can determine, identical in spore characters 
with Boudiera areolata of European authors. Whether the ap- 
parent differences in gross characters are of specific importance 
can be determined only by the collection and study of more abun- 
dant field material. 
Explanation of Plate CXXIII 
Spores and paraphyses drawn with the aid of the camera lucida to a 
common scale and with the same combination of lenses used in drawings of 
Lamprospora spores, Mycologia 6 : pi. 114. 
1-4. Boudiera sp. from plant collected by Thaxter in Maine, 1, plant about 
natural size; 2, plant X 7; 3-4, ascus with spores and paraphysis X 45 °. 
5-6. Boudiera areolata Cooke & Phill.; 5, partially matured spore; 6, ascus 
with mature spores X 450. Drawn from material collected in North Wales 
and apparently a part of the type. 
7-10. Sphaerosoma echinolatum Seaver; 7, young spore; 8, partially ma- 
tured spore; 9 and 10, ascus with spores and paraphysis X 450. Drawn 
from type. 
*> Grevillea 7: 57. 1878. 
