SHOWING STRUCTURE, FROM THE RHYNIE CHERT BED, ABERDEENSHIRE. 865 
The resting-spores of Fungus No. 2 shown in fig. 63' contain an intrusive 
fungus, the mycelium of which bears spherical spores of a smaller size. Two of the 
specimens from the group in fig. 63 are more highly magnified in figs. 64 and 65. 
These figures show that the small spores exhibit differences in size. They also show 
clearly that the spores are borne on a fine mycelium which may be traceable for a 
considerable length, or may only remain like a tail or appendage to the spore. 
Similar remains of the mycelium attached to small spores from another specimen 
are seen in fig. 66. 
The large resting-spore represented in fig. 67, on the other hand, contains a 
number of rather large thin-walled spores. Within these, again, are small spores that 
are seen to have belonged to an intrusive fungus by the remains of hyphse attached 
to some of them (fig. 68). 
The intrusive fungus with it’s thin-walled vesicles or spores completely fills the 
oval resting-spore in fig. 69. At one point hyphse ending in vesicles have burst 
through the enclosing wall of the large resting-spore (fig. 70). The behaviour of 
this specimen may be compared with that of the fungus described under No. 11. 
Lastly, as in the case of the intrusive Fungus No. 14, related to the larger 
resting-spores, the thin-walled spores may be formed on the exterior of these 
resting-spores of type 2. An example of this condition is shown in fig. 71. 
Some Other Figured Specimens. 
Small spores similar to those described above as occurring within large resting- 
spores are also met with distributed through the more decayed fragments of the 
vascular plants. As a rule, the mycelium is not to be recognised. No advantage 
is to be gained by detailed descriptions of such remains, which, in some cases, 
probably belong to forms recognised above. It will be sufficient to illustrate one 
or two examples. 
The small resting-spores shown in figs. 72 and 73 were well defined and rather 
thick-walled. They were scattered through a decayed stem of Rhynia Gwynne- 
Vaughani. The still smaller dark spores shown in figs. 74 and 75 were similarly 
distributed through amorphous decayed stems of Rhynia major. Among them 
(fig. 74) were a few larger spherical thin-walled spores. Within these latter there 
were often some four spore-like bodies without any indication of mycelium. An 
example is shown in fig. 76. 
Spore-like bodies from another decayed fragment of tissue are represented in 
figs. 77 and 78. The appearance of these is rather different from the well-defined 
fungal spores, and suggests comparison with small cells of Algse or Cyanophycese, 
forming an irregular colonial mass. Such a possibility, though there is no ground 
for a definite conclusion, must be borne in mind in considering a number of the 
less-defined remains in relation to which no mycelium can be demonstrated. 
This applies, for instance, to the spherical colonies of small dark cells which are 
