from the Nortliumherland Coal-fidd. ''I'll 



being three or four times that of the branches, the terminal 

 vesicles being much larger. 



Several specimens of this species have occurred ; and we 

 have two or three of what we consider to be a variety of it, 

 with similar branches ; but neither have they bulbous enlarge- 

 ments nor arc they papillose. The peculiarities of this variety 

 are probably owing to its state of development. 



2. Archagaricon glohuliferum. 



Tubes various in size, the larger about ytujit inch in dia- 

 meter, smooth ; both stems and branches straight or very 

 little sinuous, with numerous globular enlargements five or 

 six times the diameter of the tubes, and with a few extremely 

 large spherical vesicles, many times larger than the globular 

 enlargements, some of them being ~ inch in diameter. 



This species is distinguished from A. hulhosiim by the 

 straightness, smoothness, and minuteness of the branches, and 

 also by the more numerous globular enlargements, and parti- 

 cularly by the great size of the terminal vesicles. Several 

 specimens have been obtained. 



3. Archagaricon radiatum. 



Tubes large, measuring ^i^ inch in diameter, short, smooth, a 

 little tortuous, and appearing as if radiatjng from centres, but 

 not with much regularity ; their margins are not ahvays ex- 

 actly parallel, but usually somewhat iiTCgularly sinuous. 



This is a very characteristic species, and cannot be con- 

 founded with any other. We have two specimens exactly 

 agreeing in the above characters ; a third has, in addition to 

 the radiating tubes, large, irregular, rounded vesicles. The 

 variation is probably owing to a different state of development. 

 The fungus is elongated and rather small. 



4. Archagaricon dendriticum. 



Tubes very minute, Yr,\r^ inch in diameter, arranged in den- 

 dritic tufts in connexion Avith the ])eriphery of the organism, 

 and having interspersed large elliptical vesicles, which are 

 apparently terminal. When the branches are crowded, the 

 tuft-like arrangement is obscured. 



We have only two specimens of this pretty species ; they are 

 iiTCgularly circular, and are rpiite miiuite, being only j'^ inch 

 in diameter. They do not exactly agree in internal structure, 

 one of them having the terminal elli[)tical vesicles much more 

 numerous than the other, and the organism crowded through- 

 out with a vast number of similar vesicles. 



