292 LETTER XXV. 



the lines of the French poet Delile, even better than 

 to the zoophytes to which allusion was more particu- 

 larly made : — 



Voyez vous se mouvoir ces vivans arbrisseaux 

 Dont I'etrange famille habite dans les eaux, 

 Et qui, de deux etats nuance merveilleuse 

 Confondent du savoir I'ignorance orgueilleuse. 

 De I'humile sejour ces douteux habitans 

 A I'ceil inattentif ecbapperent long-temps; 

 lis vivaient inconnus, et sujets de deux mondes. 

 En 86 multipliant voyageaient sur les ondes. 



EXPLANATION OF PLATE XXV. 



1. The Lichen Tribe. — 1. A specimen of the Yellow Wall Par- 

 melia (P. parietina), growing on a piece of pale. — 2. A section of the 

 same magnified. — 3. A perpendicular section of a shield; a a, thecae, 

 with the spores in them. — 4. The spores. 



n. The Sea-weed Tribe. — 1. A mass of Capillary Conferva (C. 

 capillaris). — 2. A thread highly magnified. — 1*. Palmetta Sea-weed 

 (Rhodomenia palmetta), natural size, with its masses of reproductive 

 matter. — 2*. A portion of the plant with reproductive particles col- 

 lected in clusters of 3 or 4.-3*. A portion of the last highly mag- 

 nified. — 3**. Clusters separate. — 4*. A bit of the plant with one 

 of the masses of reproductive matter. — 5*. Spores. — The latter after 

 Greville. 



in. The Mushroom Tribe. — 1 . A patch of tan, on which young 

 plants of the Veiled Agaric (Agaricus volvaceus) are growing. — 

 2 — 8. Progressive developement of a young plant. — 9. A plant 

 just ready to burst its wrapper. — 10. The same bursting its wrapper. — 

 1 1. A plant emerging from the wrapper, a. — 12. A perfect plant; a 

 the wrapper, or volva. — (After Th. Nees von Esenbeck.) 



