— 24 — 



As Schiffner has pointed out, however, the closest ally of C. Loitlesbergeri 

 is C. compacta. In this species the inflorescence is autoicous and the rrouth of 

 the perianth long-ciliate, while the size and color of the plant and the size of the 

 leaf-cells are much the same as in C. Loitlesbergeri. In C. ccmpacta, nevertheless, 

 the lobes of the leaves are acute rather than acuminate, the bracts are distincth 

 bifid, their divisions are shortly acute instead of being long-acuminate, and the 

 cilia at the mouth of the perianth are shorter. 



7. Radula fi.accida Lindenb. & Gottsche; G. L. & X. Syn. Hep. 726. 



1847- 



Collected in March, 19 15, on leaves of Trichomanes sphenoides Kunze, on 

 Hattie Bauer Hammock, Dade County, Florida, by J. K. Small and C. A. Mosier. 

 New to the United States but ■widely distributed in tropical North and South 

 America. 



In its constantly cpiphyllous habit R. flaccida is almost unique among the 

 American species of Radula. It lies closely appressed to the lea%-es upon which 

 it grows, its lobes are rounded, its lobules are more or less sharp-pointed and its 

 long, funnel-form perianth narrows very gradually toward the base. The most 

 distinctive organs of the species, however, are its discoid gemmae, which are 

 characterized by their large size and complex structure. Since the development, 

 mature structure, and germination of these gemmae have been fully describe<l 

 and figured by Miss Williston, it will be sufificient here to refer to her paper.' 

 Similar gemmae had been described a few weeks earlier in the .\frican E. epiphylhi. 

 Mitt, by Goebel.2 



8. Cololejeunea subcristata sp. nov. 



Collected in March, 1915, on lea\es of Tectaria minima I'nderw.. on Hattie 

 Bauer Hammock, Dade County, Florida, by J. K. Small and C .\. Mosier (No. 

 5327); also on leaves of Trichomanes Krau.ni Hook. & Grev., on Nixon-Lewis 

 Hammock, Dade County, by the same collectors (No. 6008). No. 5327 ma\- 

 be designated the type. 



Plants delicate, pale green, often becoming bleached with age. scattered 

 or growing in small thin patches: stems prostrate, about 0.05 mm. in diameter, 

 irregularly and sometimes rather abundantly branched, the branches widely 

 spreading, essentially like the stem but usually with somewhat smaller leaves: 

 leaves loosely imbricated, obliquely to widely spreading, plane or nearly so. 

 the lobe ovate, often arching partially across the axis dorsally, when well devel- 

 oped 0.4-0.45 mm. long and 0.25-0.3 mm. wide, but often considerably smaller, 

 abruptly narrowed to a broad, acute to rounded apex, margin varying from sub- 

 entire to vaguely and irregularly crenulate from projecting cells; lobule usualK" 

 well developed, strongly inflated with an arched keel, ovate, about 0.15 mm. long 

 and 0.09 mm. wide, free margin involute as far as the apical tooth, the latter 

 usually consisting of two cells in a row, the hyaline papilla at the base of the 

 tooth on the inner surface, proximal tooth indistinct, consisting of a rounded 



' Bull. Torrey Club 39: 329-336. 

 -Flora 104: 156. 1012. 



