ORGANOGRAPHY. 



CHAPTER 1. 



GENERAL MORPHOLOGY OF THE PLANT. 



The simplest plants, such as the Eed Snow (Protococcns) and 

 Oscillatoria, consist merely of a single cell. This cell may, how- 

 ever, vary much in its form ; thus in tlie Red Snow-plant {figs. 1 

 and 2), it is round ; in the Oscillatoria {fig. 3) lengthened ; in 



Fig. 1. 



Fig. 3. 



Fig. 2. 



Fig. 1. Several Red Snow-pTants (Protococcus (Palmella) ni- 

 valis), enclosing minute hodies called spores, magnified 



Fig. 2. One plant still more highly magnified. 



Fig. 3. Two plants of Oscillatoria spiralis. 



Fig. 4. A species of mould (Mucor), with mycelium helow, from which 

 two stalks are seen to arise, each of which is terminated by a sac (cysti- 

 dium), from which a number of minute bodies (spores) are escaping. 

 Fig, 5. Another mould (Penicillimn), with mycelium and stalk bear- 

 ing several rows of cells, which are the germinating spores. Fig. &. 



Another mould (Botrytis), with mycelium and stalk, which branches 

 above, and each ramification bears a rounded spore. 



