File:EB1911 Lichens - Usnea barbata (3).jpg

DescriptionEB1911 Lichens - Usnea barbata (3).jpg	English: Usnea barbata (Mag. more than 500 times; see legend below).
Date	published 1911
Source	Encyclopædia Britannica (11th ed.), v. 16, 1911, “Lichens,” fig. 12, p. 581.
Author	After Schwendener, from De Bary’s Vergleichende Morphologie und Biologie der Pilze Mycetozoen und Bacterien
Permission (Reusing this file)	Public domainPublic domainfalsefalse This image comes from the 13th edition of the Encyclopædia Britannica or earlier. The copyrights for that book have expired in the United States because the book was first published in the US with the publication occurring before January 1, 1929. As such, this image is in the public domain in the United States.

c, An isolated mature soredium, with an algal cell (Pleurococcus) in the envelope or hyphae.

d, Another with several algal cells in optical longitudinal section.

e, f, Two soredia in the act of germinating; the hyphal envelope has grown out below into rhizoid branches, and above shows already the structure of the apex of the thallus (see EB1911 Lichens - heteromerous lichen thallus.jpg).