54 BOTANICAL GAZETTE [January 



v> 



not develop directly into a leafy plant, but produces a protocorm 

 with protophylls, resembling a miniature Phylloglossum. 



Treub (9) next dealt with L. Phlegmaria, another familiar tropi- 

 cal species, epiphytic upon trees. The prothallia are found on the 

 tree trunks just below the surface of the humus, but they have no 

 chlorophyll, being entirely saprophytic and abundantly supplied 



with an endophytic fungus. The main body is tuberous, about 

 2 mm. in diameter, more or less spherical or somewhat elongated, 

 and has several branches extending in various directions. The 



* 



branches vary from 1 to 6 mm. in length and bear antheridia or 

 archegonia or reproductive bodies which Treub called "propagula. 

 The antheridia and archegonia are usually at the tips of the 

 branches, not at the base as in L. cernuum. The propagula are 

 of two general types, one consisting of scores or even hundreds of 

 cells forming a flask-shaped body with a slender stalk of one or two 

 cells; the other is much smaller, more or less spherical in shape, 

 and consists of only a few cells, usually not more than 2 or 3, with 

 the outer walls very much thickened. In the first type the propag- 

 ula break off at the stalk and grow directly into new prothallia, 

 while in the second type there is a more or less prolonged resting 

 period. The first type seems to correspond to the gemmae of 

 liverworts and mosses, and the second type seems to correspond 

 to the brown bulbils of mosses. 



Treub was not able to germinate the spores, and he believed 

 that most of the prothallia found in nature come from propagula, 

 prothallia from spores being comparatively rare. 



The accounts of the development of antheridia, archegonia, 

 and embryo are very complete, but the vascular anatomy of the 

 sporeling is not described. 



endo 



fungus, and are the only < 

 from the spore to the adult 



gonia 



simple filament 



days the prothallia developed to the primary 

 SH rested for several months, and finally resumed 

 completed the life history. As in L. cernuum, a 





lindrical bodv several cells in thickness 



