EERATA. 



Page 4, for Cycads read Zamice. 

 8, for Hastig read Hartig. 

 10, for Browne read Broome. 

 27, for paradoxan read paradoxum. 

 32, for Birch read Beech. 

 64, for sorices read scolices. 

 81, for aBiawces read divisions. 

 107, for Nityphyllum read Nitophyllwm. 



140, for propagation rea,i fructification. 



141, for microscopium read microscopicMin. 



142, for albuminous read aluminous. 

 145, for forming lead form. 



2ii, for vdutinvs read vdutipes. 



255, line 7, for immense read Zorg'e. 



290, for oronata read coronata, 



316, for graminum read graminis. 



356, for Ncemetelia read Noematelia. 



368, substitute J. for P, in lines 2, 4, and 15. 



379, for nearly read o«?j/. 



398, for «W« read SAeir. 



420, line 1 4, strike out lampblack. 



461, for Oosppert read Berendt. 



ADDENDA. 



Page 77. Meneghini has figured annular vessels in Sargassum linifolium 

 See Alghe Italiane, &c., Tav. 1 . 



Page 104. For directions for mounting microscopic specimens, see p. 420. 



Page 282. The terms applied by Tulasne to the secondary or male fruit of 

 Hphaerim and Lichens, require explanation to those who are not in possession of 

 his Memoirs When the fruit is conceived to be merely secondary, the peri- 

 thecia are termed pycnidia, and their fruit stylospores ; where it is supposed to 

 be of sexual importance, the perithecia are styled spermatogonia, and their 

 deciduous granules spermatia. Stylospores and spermatia may, however, be 

 produced on threads not inclosed in perithecia. The term conidia is applied 

 to such secondary granules as are neither stylospores nor spermatia. 



Page 547. Hofmeister has lately given an account of the germination of the 

 spores oX Botrychium Lvnaria in Bonplandia. 



