JOURNAL OF MICROSCOPICAL SCIENCE. 
DESCRIPTION OF PLATE III, 
Illustrating Mr. Archer’s Paper on Apothecia in some 
Scytonemacee and Sirosiphonacee. 
From Scytonema myochrous. 
Fic. 1.—Ascus with 4 spores. 
2.—Single spore x 400. 
From an unidentified Scytonema. 
3, 4, 5.—Apothecia, 
6.—Mature apothecium. 
7.—Same (in ouline) burst, to show protruding asci and paraphyses. 
8.—Spore x 400. 
9—1].—Showing internal agglomeration of brownish-coloured granules 
causing swellings of the filaments (incipient apothecia ?). 
From Sirosiphon alpinus. 
12.—Fully formed apothecium. 
13.—Younger apothecium. 
14.—Spore x 400. 
15.—Ascus, immature, with paraphyses, showing contents contracted 
into a fusiform figure and divided transversely. 
16, 17.—Immature asci with paraphyses. 
18.—Showing portion of an apothecium burst so as to cause the 
8-spored asci, with paraphyses, to become extruded (the rent 
portion of the apothecium not shaded). 
From Sirosiphon pulvinatus or S. Heufteri. 
19.—Immature apothecium. 
20.—Outline of mature apothecium. 
21.—Immature asci. 
22.—Mature ascus with 8 spores. 
23.—Spore x 400. 
From Stigonema mamillosum. 
24.—Apothecium. 
25.—Immature asci with paraphyses. , 
26.—Spore x 400. P 
