-65- 



Aside from the differences already mentioned, however, the caducous habit of 

 the "var. implexum" is never developed to so surprising an extent as in B 

 nudicaulis. 



g. Leptocolea cardiocarpa (Mont.) Evans, Bull. Torrey Club 38: 268. 

 pi. 12, f. 1-3. 1911. L. Jooriana (Aust.) Evans, Ibid. 38: 270. 1911. 



In discussing the species of Leptocolea found in Porto Rico, the writer 1 

 recognized both L. cardiocarpa and L. Jooriana as valid but pointed out their 

 very close relationship. The only important distinction brought out was in 

 the inflorescence, L. cardiocarpa being described as autoicous and L. Jooriana as 

 paroicous. A few years ago the autoicous L. cardiocarpa was reported for the 

 first time from the United States, on the basis of specimens collected by Rapp 

 near Sanford, Florida. The paroicous L. Jooriana had long been known from sev- 

 eral of the Southern States. 



It now appears that the supposed distinction between L. cardiocarpa and 

 L. Jooriana is inconstant. The first suspicion that this was the case came from 

 the study of gemmiparous material of L. Jooriana, likewise collected at Sanford 

 by Rapp. It was found that one of the gemmae, upon germinating, gave rise 

 to a simple shoot, which almost immediately bore a male spike with imbricated 

 bracts, similar in all essential respects to the male spikes of L. cardiocarpa. The 

 suspicion became a certainty from the study of additional material from the same 

 locality, where both paroicous inflorescences and elongated male spikes were 

 sometimes found on a single individual. It therefore becomes necessary to reduce 

 L. Jooriana to synonymy as indicated above. 



10. Frullania inflata Gottsche; G. L. N. Syn. Hep. 424. 1845. F. 

 mexicana Lindenb. op. cit. 425. 1845. F. Rappii Evans, Bryologist 15: 22. 

 /. 1-9. 1912. 



In 1912, the writer proposed F. Rappii as a new species, basing it on material 

 collected by S. Rapp at Sanford, Florida. In comparing it with other autoicous 

 members of the genus its very close relationship with F. inflata was pointed out, 

 but what seemed to be a trustworthy distinction was drawn from the local thick- 

 enings of the walls of the leaf-cells. In F. Rappii these included not only trigones 

 but also intermediate thickenings, the latter being especially numerous in the 

 lobules but occurring also to some extent in the lobes. In F. inflata the only 

 thickenings present were supposed to be the trigones. 



It has since been demonstrated, through the studies of Miss Haynes and the 

 writer, that the distinction just noted is far from constant. Although the leaves 

 of some of the more lax specimens of F. inflata from northern localities seem to 

 show a complete lack of intermediate thickenings in the walls of their cells, care- 

 ful search will usually reveal an occasional such thickening in the lobules, even 

 in cases where none are present in the lobes. In specimens from more southern 

 stations there is a tendency toward an increase in the number of lobular thicken- 

 ings, while similar thickenings make their appearance in the lobes, until the 

 condition characteristic of F. Rappii is reached. Since the other slight distinctions 



« Bull. Torrey Club 38: 261-271. 191 1. 



