44 BLEACHED WOOD OF THE ARCTIC VOYAGERS. 
paraphyses slender. Sporidia curved, subfusiform, yellow-brown, quin- 
queseptate, about 51; of an inch long. 
The perithecia are rather larger than those of the other Fungi com- 
monly present in similar situations. The contents are white. Another 
species, with cellular sporidia and salmon-coloured jelly, occurred on 
the same wood, but in extremely small quantities. Nothing can be 
more variable than the ostiola of the species I have described. Even 
in extreme cases it is entitled only to a place amongst the Platystome 
from affinity rather than well-defined characters. 
EXPLANATION OF THE FIGURES. 
(Tas. III.) 
Fig. 1. Spores of Phoma fibricola. a. On ash. 6. On Oak. 
The spores in this and the other species figured are drawn on a 
scale as seen with a magnifying power of 250 diameters, except 
where it is expressly said that they are more highly magnified. 
Fig. 2. Spores of Phoma epileuca. 
Fig. 3. Spores of Phoma ulmicola. 
Fig. 4. a. Spore of Phoma inophila. b. The same, more highly mag- 
nified. 
- ‘Fig. 5. a. Perithecium of Phoma mucifera, sending out a tendril of 
mucous matter filled with spores, when placed in a drop of water 
on the field of the microscope. 6. Spores of the same. c. Spores 
more highly magnified. 
Fig. 6. a. Spores of Phoma bicuspidata. b. The same, with sporophores 
highly magnified. 
Fig. 7. a. Perithecium from a fissure in the Arctic Elm plank. 6. Spores 
of the same. The spores of this have not been measured with the 
micrometer. 
Fig. 8. A sporidium of some Lichen found in the same fissure. 
Fig. 9. Spores of Sporidesmium Lepraria, var. nigerrima. 
Fig. 10. Hendersonia fibriseda. a. Portion of edge of perithecium. 4. 
Spores seated on their sporophores. 
Fig. ll. Diplodia dospora. a. Spores on their Sporophores. 6. The 
same more highly magnified. 
Fig. 12. Diplodia fíbricola. a. Spores. 6. The same, more highly 
magnified. c. The same, from sketch by Mr. Broome. d. Peri- 
thecium seated on the fibres of the wood and medullary rays, which 
