232 ORGANOGRAPHY. BOOK I. 



through tlie 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 off 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 



Algse ; as in Gloionema of Greville. Crypt. Jl. 6. 30. 



6. Pseudoperitliecium ; 



7. Pseudohymenium ; 



8. Pseudopei'idium ; 



terms used by Fries to express such 

 coverings of sporidia as resemble 

 in figure the parts named peri- 

 thecium, hymenium, and peridium in other plants; see 

 those terms. 

 9. Sporidia ; granules whicli resemble sporules, but which 

 are of a doubtful nature. It is in this sense that Fries 

 declares that he uses the word : vide Plant, liomonom. 

 p. 294. They are also called Sporce. 



10. Phycomater, Fries; the gelatine in which the sporules of 



Byssaceae first vegetable. 



11. Vesiculce; inflations of the thallus, filled with air, by means 

 of which the plants are enabled to float. 



12. Hypha, Willd. ; tlie filamentous, fleshy, watery thallus of 

 Bvssaceae. 



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 



