HYPOXYLON AND ITS ALLIES. 
131 
7G. Hypoxylon chalybeum, B. ofc Br. Rosellinia nitens , Sacc. Syll., 
No. 945. 
If this is a Rosellinia , then Rosellinia must practically be 
synonymous with Hypoxylon — because there is really no feature 
whereby this can be distinguished from Hypoxylon annulatum. 
There are seven reputed species in this section with annulate 
ostiola. 
1. H. polyspermum, Mont., (1479.) 
Sporidia -005 x '002 mm. 
2. H. marginatum, Scliwz. (1414.) 
Sporidia -007 X *0035 mm. Cuba. 
„ '008-'009 x '004 mm. Africa. 
„ *009- '01 x '004 mm. U. States. 
3. H. durissimum, Schwz. ( 1 447.) 
Sporidia •008- , 009 X *0035 mm. 
4. H. annulatum, Schwz. (1384.) 
Sporidia *012 x ‘0035 mm. Montagne. 
„ 'Ol-’Oll x -0035 mm. U. States. 
5. H. chalybeum, B. SfBr. (945.) 
Sporidia ‘012 x *005 mm. Ceylon. 
„ , 009- , 012 x *0045 mm. Cesati. 
6. H. Pouceanum, Berk. <k Che. 
Sporidia *015 X '004 mm. 
7. H. obesum, Fr. (1401.) 
This species we do not know. 
Our conclusions as to these species are — that H. polyspermum , 
Mont., is a distinct species not only in difference of habit, but in 
its very small sporidia. That H. marginatum comes next, with 
H. durissimum as a synonym. That H. annulatum follows with 
H. chalybeum as a synonym, and H. Pouceanum finally — with the 
largest sporidia, if it be not really a variety of H. annulatum. 
Thus the seven species (reckoning H. obesum as probably a good 
species) would be reduced to four or five. In H. chalybeum , the 
original specimens extend for some inches with the perithecia im- 
mersed in a thick black carbonaceous stroma. If the specimens 
of H. chalybeum and H. annulatum now before us, some 40 in 
number, had their labels removed, and were mixed up together, it 
would be impossible to separate them again either by external 
features or fructification, although it is not difficult to separate H. 
marginatum from II. annulatum both by external features and by 
the fructification. 
90. Hypoxylon mascariensis, Berk, in Herb, nec Montagne. 
Hemisphericum, atrum, nitidum (2 mm.). Peritheciis globosis, 
majusculis, atris, subprominulis, ostiolo papillato prseditis. Ascis 
cylindraceis. Sporidiis subellipticis, fuscis ('012 x '005 mm.). 
On bark. British Guiana. 
Externally resembling Montagne’s species, but not truly erum- 
pent, and fruit quite different. 
