NOTEWORTHY LEJEUXEAE FROM FLORIDA 133 



liferating (so far as observed) ; bracts in one or two pairs, similar to 

 the leaves but less widely spreading and with relatively shorter lobes, 

 monandrous: capsule about 0.18 mm. in diameter: spores greenish, 

 12-20 iJL in short diameter, minutely verruculose: gemmae abundantly 

 produced, about 0.05x0.06 mm., composed (normally) of twenty 

 cells, each apical quadrant cutting off three segments, margin crenulate 

 from projecting cells, the youngest two segments on each side sharper, 

 organs of attachment none. [Fig. i.] 



On bark of trees. Florida: Sanford, 191 3-1 91 7, S. Rap p. The 

 specimen collected in 191 5 (September 28), which bears well-developed 

 perianths, may be designated the type. The specimen collected in 

 1913 was at first referred by the writer to C. Biddlecomiae and is re- 

 ported under this name by Miss Haynes. 



Among the species of Cololejeunea known from Florida, C. Biddle- 

 comiae (Aust.) Evans and C. tuherculata Evans agree with C. con- 

 tractiloha in having roughened leaves and perianths. In all three 

 cases the roughness is due to projecting cell-walls, more or less thick- 

 ened at the tips of the projections. It is best marked in C. tuherculata, 

 where the lobules as well as the lobes of the leaves and perichaetial 

 bracts are usually roughened and where the projections are longer and 

 more thickened at their tips. In the other two species the lobules 

 are invariably smooth, and the projections are shorter and less thick- 

 ened. 



The lobules of the new species are especially interesting because 

 they show the features characteristic of the genus in an abridged or 

 reduced form. In other words the apical tooth, instead of being two 

 cells or more long, consists of a single projecting cell, while the proximal 

 tooth is scarcely apparent. The apical tooth is further remarkable 

 because it lies in a more ventral plane than the rest of the free margin, 

 the hyaline papilla lying in the same plane. In both C. Biddlecomiae 

 and C. tuherculata the apical tooth is normally two cells long and lies 

 in the same plane as the rest of the margin, while the proximal tooth 

 is usually distinct. 



Aside from the differences just noted C. contractiloha differs from 

 C. Biddlecomiae in its smaller size, in its lack of a filiform stylus, and 

 in the narrower lobes and lobules of its perichaetial bracts ; it differs 

 from C. tuherculata in its slightly larger size, in the entire lobules of 

 its perichaetial bracts and in the distinct beak of its perianth. Four 

 other speceis of Cololejeunea are definitely known from Florida at the 

 present time. Since, however, the leaves of all are smooth or nearly 

 so, there is little danger of confusing them with the present species. 



