30 



that cultivation be carried farther, until, if possible, ascus fruit is 

 produced from the thallus, 



Bonnier had noticed that moss pr'otonema was attacked by 

 some kind of fungus, and it occurred to him that the Hchen- 

 building fungus might be brought to use another host if the 

 proper alga forms were not to be obtained. He therefore culti- 

 vated moss protenema on sterilized sand, in an apparatus arranged 

 so that no germs were allowed to enter from the air. In this way 

 he raised several mosses, Hypnimi cupressiforniey Barbiila 7ntir- 

 alis, Ftmaria hygrometricay Mnium hornitm^ Dicraitella varta 

 and Phasctim cuspidaUt7n^ On these developed cultures he then 

 sowed the lichen spores. In other cases he sowed lichen and 

 moss spores at the same time. He was able to follow the growth 

 of these spores, some of them, under the microscope ; saw the 

 protenema of the moss seized by the growing lichen spore and 

 gradually invested with it in the same manner as observed in the 

 case of filamentous algae. These hyphae, branching and anas- 

 tomosing, finally built an elegant network about the moss-pro- 



tonema. 



Bonnier then tried to substitute other algae forms in lichens 

 having only a certain kind. He placed the germinating lichen 



spores in the presence of the foreign algae, but in, most cases, 



failed to produce a thallus. Twice in case of Parmelia parietina 

 however, he succeeded. The normal alga of this lichen is Proto- 

 coccus viridis and he obtained lichens with Protococciis botryoides^ 

 and what Is still more conclusive, with an alga of quite different 

 form, namely, Treniepohlia abietina, a reddish filamentous alga. 



E. L. G. 



Index to Recent American Botanical Literature. 



Acrosiichiim Hartii, Baker, n. sp. — J. G. Baker. (Journ. Bot., 

 xxvL, 371). Description of a new species from Trinidad, 

 named for the collector, Mr. John Hart. 



A}idropogo?i — Notes on. — F. Lamson Scribner. (Bot. Gazette, xiii.» 

 294-296.) 



Berberis FendlerL — Sereno Watson. (Garden and Forest, i., 460, 

 fig- 72.) 



