232 
ORGANOGRAPHY. 
BOOK I. 
through the general mass of each plant, or collected in cer- 
tain places which are more swollen than the rest of the stem, 
and sometimes resemble the pericarpia of perfect plants. 
The terms used in speaking of the parts of Algae are the 
following : — 
1. Gongylus; a round hard body, which falls olf the mother 
plant, and produces a new individual : this is found in 
Fuci. W, 
2. Tliallus ; the plant itself. 
3. Apothecia; the cases in which the organs of reproduction 
are contained. 
4. Peridiolum, Fr. ; the membrane by which the sporules are 
immediately covered. 
5. Granula ; large sporules, contained in the centre of many 
Algag ; as in Gloionema of Greville. Crypt. Jl. 6. 30. 
6. Pseudoperithecium; 1 terms used by Fries to express such 
7. Pseudohymenium ; r coverings of sporidia as resemble 
8. Pseudoperidium ; J in figure the parts named peri- 
thecium, hymenium, and peridium in other plants : see 
those terms. 
9. Sporidia ; granules which resemble sporules, but which 
are of a doubtful nature. It is in this sense that Fries 
declares that he uses the word : vide Plant homonom, 
p. 294. They are also called Spores. 
10. Phycomater^ Fries ; the gelatine in which the sporules of 
Byssaceae first vegetable. 
11. Vesicidce; inflations of the thallus, filled with air, by means 
of which the plants are enabled to float. 
12. Hypha, Willd. ; the filamentous, fleshy, watery thallus of 
Byssaceae. 
13. Nucula ; one of the apothecia of Characeae ; described by 
Greville to be a sessile, oval, solitary, spirally striated 
body, with a membranous covering, and the summit 
indistinctly cleft into five segments containing sporules. 
14. Globules ; the second organ of Characeae ; the excellent 
observer last quoted describes it as a minute round body 
of a reddish colour, composed externally of a number of 
triangular (always ? ) scales, which separate, and produce 
its dehiscence. The interior is filled with a mass of 
