EXTRACTS AND ABSTRACTS. 19 
y do not differ from the 
sporangia of Dyctyuctus and of Diplanes. This condition, moreover, 
has been shown by Pringsheim to occur occasionally in Achlya 
o 
detached one by one and germinate. 
heim of the results of a series of experiments on the formation of the 
i sses. The researches of Dr. S are not only 
entirely confirmatory of these results, but in several points tend to 
_ The well-known observations of Farlow* on the development of the 
leaf- and spore-béaring (asexual) generation of Ferns from a pro- 
thallium barren of archegonia (as in Pteris eretica) formed the first 
side and the spores on the other are the turning-points in the 
experiments with a view to deciding this in the case of the Bast- 
tomycetes and Ascomycetes. Conclusions in favour of its not 
time, Dr. Stahl was, on the other hand, convinced of the sexuality of 
the Lichens, which he considers undoubtedly to belong to the Ascomy- 
* See Journ. Bot., 1874, p. 185. ry 
Cc 
