204 : The Botanical Gazette. 
They project outwardly from the sporangium wall and are 
attached to its outer surface so slightly as to be readily broken — 
off, leaving a ring-like base, thus giving the membrane of the 
wall the appearance of being covered with minute elevated an- 
well as naked. : 
The various reagents which may be used in the preparation 
of the sporangium wall for microscopic examination, as for 
instance, alcohol and acidulated water, or the glycerine me 
dia used for permanent slide-mounts, will also develop the 
same annular markings, by softening and disintegrating the 
thin investing pellicle of the granules, thus freeing the 
denser nuclei which are comparatively unaffected by the 
reagents. This fact suggests the possibility of error in Com 
clusions drawn from examinations made from mounted material 
onl 
The natural relations of closely allied genera to each other 
will always prove an interesting and profitable subject for 
study, and the relations of Lindbladia and Tubulina, both 
genera belonging to the same order, LICEACE4, will serve ® 
a striking illustration of this point. ; 
The genus 7udulina shows an analogous an 
allel course of development to Lindbladia, in as 
also beginning with simple, separate, aggregate ‘a 
on a common hypothallus, and extending through va! 
similar ethalioid forms; always however having the s 
in a single rank, and finally even developing in some et 
a partial cortex. At one point of the parallel developmen” 
the two series, the analogy is so great that 
forms, if considered by themselves, would be proper! 
as species of the same genus, the generic chara 
similar. 
Yet Lindbladia, especially through its simple 
nearly resembles in some important structural ¢ + thanit 
order HETERODERMEZ through its genus Cribraria, : 
does the analogous genus Tubulina of its own oF rae exist’ 
These special points of correspondence are first, na ae 
ence of plasmodic colored granules throughout te 
d nearly pat- 
eries of forms 
