1835.] Formation and Changes of inferior Plants, 63 



It is worthy of remark, that the Protococcus is often 

 found in dry places, for it seems that it never appears in 

 water except when the sun is shining on it, and the Hygro- 

 crocis and Leptomitus appear in the shade. It has been 

 observed that the algae (algues) are formed after the death 

 of the Infusorii, especially the Enchelys pulvisculus. When 

 the water in which this animal is found, is evaporated, the 

 latter contracts after death into globules. These possess at 

 first their transparency at the extremities, which correspond 

 to the head and tail ; but gradually they contract into ti ring 

 surrounded by other globules, and assume an appearance 

 resembling Protococcus; only it is mucilaginous when 

 united in large masses, and is therefore more like Palmella. 



At this time an Oscillatoria begins to appear, which Kut- 

 zing terms hrevis. It is always the same plant. The author 

 confirms the accuracy of the observation of Treviranus 

 with regard to the motion of the sporules of algse. He ob- 

 served the motions of millions of globules while examining 

 the Draparnaldia plumosa in a glass of water. Under the 

 microscope he noticed, that as the green border (which was 

 formed on the second day after depositing the plant in 

 water), increased, the filaments of the Draparnaldia, lost 

 their green colour and became hyaline, and the globules 

 resembled then the Cymbella (Frustulia.) These move- 

 ments somewhat resemble those of pollen in spirit of wine, 

 camphor in water, &c., but they are of longer duration. 

 By keeping a Protococcus which was seated on sandstone 

 constantly wet, the globules became connected, filaments 

 were formed, and a conferva produced, which he calls 

 tenerrima{C MuralisSi^reng.) This plant is found in the 

 waters of reservoirs, and is transformed into an alga of a 

 superior order, the Inoderma, Kutzing observed the 

 Alysphceria Jiavo-virens to be produced from ih^ Protococcus 

 viridis, by the conversion of the globules into dichotomous 

 filaments. 



He found likewise, that by examining the structure of the 

 Parmelia parietina, it is observed, that the globules of the 

 Protococcus viridis, which occurs on trees along with the 

 lichen, enter into its frond, and that the latter is the first state 

 of the lichen. Upon the upper part of trunks of trees, we 

 observe the Parmelia parietina. At the base we notice 



