— 6o— 



The bracts spread obliquely and are complicate with a sharp but wingless keel. 

 The lanceolate lobe measures about 0.45 x 0.14 mm., the apex is acute or obtuse, 

 and the margin is either entire or shows one or two projecting cells. The lobule 

 is ligulate or linear, about 0.17 x 0.05 mm., and shows, in normal cases (figs. 12, 

 13), an apical tooth composed of two superimposed cells and a sharp proximal 

 tooth; these peculiarities, however, are often poorly brought out. The peri- 

 anth (fig. 6) is obovoid and measures about 0.6 mm. in length by 0.25 mm. in 

 diameter. Although terete in the lower part it is indistinctly five-keeled to- 

 ward the apex, the keels being usually reduced to short rows of projecting cells; 

 otherwise the surface is smooth. The apex is truncate and the beak is short 

 and often indistinct. The male inflorescence is terminal on the stem or on a 

 leading branch, and no cases of proliferation have been observed. The mon- 

 androus bracts are mostly in from three to ten pairs and become separated 

 with age (fig. 9). They resemble the leaves but are smaller and have a more 

 strongly inflated lobule. The capsule is about 0.15 mm. in diameter, and the 

 spores, which are greenish and scarcely roughened, are about 8 ix wide. 



Vegetative reproduction is carried on by means of discoid gemmae, which 

 are alluded to in Lehmann's original description. They are produced in con- 

 siderable abundance and conform closely to the type found in other members 

 of the genus, A mature gemma (fig. 14) shows that the apical quadrants cut 

 off only two segments apiece. Each half consists of eight cells, there are three 

 organs of attachment, and usually five of the marginal cells project.^ 



Most species of Cololejeunea are exceedingly variable, and C. Camilli is no 

 exception to this rule. The variability shows itself particularly in the form 

 and size of the leaf-lobes and in the degree of complexity which is attained by 

 the lobules. Much of this is due simply to arrested development, but, since 

 this condition sometimes persists in male plants until the formation of antheridia, 

 it cannot be left wholly out of consideration. In one case, for example, a plant 

 growing from a gemma produced a few rudimentary leaves and then, without 

 branching, formed a short antheridial spike of the usual type, thereby terminat- 

 ing its growth. The female plants seem invariably to reach a higher stage of 

 development than the male plants, but even in these the lobules are usually 

 represented by minute basal folds and the lobes fall short of reaching the max- 

 imum size. 



One of the closest allies of C. Camilli is C. diaphana Evans, ^ originally de- 

 scribed from Florida but since detected in material from Porto Rico.^ This 

 species grows on both bark and leaves. It is even more delicate than C. Ca- 

 milli, its leaves are somewhat smaller, measuring about 0.45 x 0.2 mm. in max- 

 imum size, and the margins of the lobes are minutely crenulate or denticulate 

 from projecting cells. It differs further in its autoicous inflorescence and in 



1 For a recent account of the genus Cololejeunea and its gemmae, see Evans, Bull. Torrey 

 Club 38: 2S1-286. pi. II, 12. 1911, 



2 Bull. Torrey Club 32: 184. pi. 5, f. g-14. 1905. 



3 Bull. Torrey Club 38: 259. text-fig. i, F. 1911. 



