ON LICHENOUS FRUCTIFICATION ON ALG. 33 
The asci, which, as elsewhere, are at first filled with a 
egrumous granular substance (figs. 16, 17), are, when mature, 
8-spored (fig. 18). Sometimes I saw asci with the conteuts 
contracted to a broadly fusiform figure, and then divided 
transversely, thus producing two conical bodies as if base 
to base (fig. 15). ‘The paraphyses seemed to be of two lengths, 
the shorter about half the length of the asci, linear, pointed, 
the longer about one half longer than the asci, nearly twice 
broader than the former, with truncate end (fig. 17). The 
spores here are different from either of the preceding, being 
uniseptate, oblong, somewhat constricted at the middle oppo- 
site the septum, each end broadly rounded, colourless, each 
cavity showing a single central bright minute corpuscle ; 
length +;';5, breadth ,,4, (fig. 14). 
Another Sirosiphonaceous form, S. pulvinatus or S. Heufleri, 
showed apothecia. Here they appeared ina young condition 
hemispherical, when mature globose, sometimes as if somewhat 
produced upwards, and truncate at the opening (fig. 20). 
Unlike the previous, they did not appear smooth when 
young, but as if slightly hirsute externally (fig. 19). The 
clavate asci sometimes appeared somewhat truncate (fig. 21) ; 
paraphyses very inconspicuous, indeed I am more inclined 
to think there were none; the asci were densely crowded. 
Many examples showed asci filled with granular contents, the 
spores not yet formed. ‘The asci when mature are 8-spored 
(fig. 22), the spores resembling in size and figure (but are 
very slightly longer than) those of the second form of Scyto- 
nema referred to, but differed in not having the two bright 
corpuscles immersed therein, and in showing a pale green 
colour. They are long and narrow, lanceolate, greenish ; 
length ==55, breadth 345 (fig, 23). 
The last form which rewarded my search in showing 
apothecia was the form recorded in ‘ Flora Hibernica’ as 
Stigonema mamillosum, but the distinction which may exist 
between the plant in question and Stigonema mammiferum, 
Thwaites, or Strosiphon coralloides, Kiitz., are not very 
apparent. Our plant grows in running water, attached to 
stones at the bottom of mountain streams. It is much more 
rare, seemingly, than any of the previous species ; anda very 
pretty plant under a moderate power of the microscope, 
especially a young and flourishing one, with the phycochro- 
maceous contents bright in colour and studded by the curious 
short and blunt branches, giving the ‘‘ mammillate” appear- 
ance. ‘I'he apothecia resemble those in the Sirosiphon above 
alluded to, they are blackish, globose (fig. 24); paraphyses 
linear, somewhat longer than the asci (fig. 25), spores 4in an 
VOL. XV.—NEW SER. c 
