The Botany of Iceland - 01.12.1928, Page 103

THE AERIAL ALGÆ OF ICELAND
427
sporis vel aplanosporis ex contentu cellulæ maternæ per divisiones succe-
daneas ortis ruptura membranæ maternæ liberatisque. Fig. 34.
E. Icel. 79.
This species shows great resemblance to Myrmecia globosa Printz
(1921, p. 14). Unfortunately it has not been possible, despite Professor
Printz’s kind exertions, to procure matenal of M.globosa for comparison.
But the description and figures of this species are so excellent that it is
quite possible to draw a comparison. I have only had Myrmecia pyri-
formis in the dried condition, but by means of lactic acid, chlor-zinc-
iodine, and potassium tri-iodide I have been able to get a fair idea of
its cell structure. What was most difficult was to ascertain the form
of the chromatophore, I think, however, that it must be parietal, bell-
shaped as in M. globosa, but in contrast to the latter it was furnished
with a pyrenoid which was very distinctly seen after soaking in warm
lactic acid, rinsing with water, and treatment with potassium tri-iodide.
Often the pyrenoid seemed to be surrounded with a quantity of starch.
Also in a preparation obtained by boiling ín 5 p. c. nitrate of silver