320 TUFTS COLLEGE STUDIES, VOL. II, No. 3 



varieties. All are found growing on bark of various trees, 

 rarely on other objects. 



Var. BETULINA (Rab.) Hariot, 1889-90, p. 50; P. B.-A., No. 

 1378. Cells ellipsoid, thick-walled, in fairly distinct filaments. 

 Principally on birch trees. N. H. Europe. 



10. T. RIGIDULA (Miill. Arg.) Hariot, 1889-90, p. 36, fig. 

 17; Chroolepus umbrinum Wolle, 1887, p. 123, in part, PI. 

 CXVI, figs. 1-3; C. rigiduhim Wittr. and Nordst., Alg. 

 Exsicc., No. 1422. Filaments reddish or yellowish, ascending, 

 stiff, subdichotomously branched, torulose, branches elongate ; 

 cells fusiform-ellipsoid, swollen, with strongly constricted 

 nodes, membrane thin, at first smooth and pellucid, soon cov- 

 ered with fine scales or fibrils ; cells 16-24 P- diam. at middle, 

 12-15 /u. at nodes, 24-36/4 long ; gametangia spherical, 30 \*. diam. 

 Cuba. Asia, New Zealand, So. America. 



A species of warm regions, always epiphytic on lichens, which 

 may be attached either to rocks or to the bark of trees. It 

 approaches some forms of T. odorata, but is more branched, 

 with cells more moniliform, and with thinner membrane.* 



2. NYLANDERA Hariot, 1890, p. 85. 



Structure as in Trentepohlia, but all or many of the cells bear- 

 ing inarticulate setae. Only one species. 



N. TENTACULATA Hariot, 1889-90, p. 41, fig. 22. Tufts 

 small, inconspicuous, brownish when dry ; prostrate filaments 

 short, little branched, 12-15 /* diam., cells spherical-ellipsoid, 

 somewhat torulose, i-i}^ diam. long; each cell usually bearing 

 on the upper surface one, rarely two or three, inarticulate setae, 

 4-5 fji wide, up to 90 //, long, with globose-capitate tip. Fig. 114. 

 On bark, So. Carolina. 



The setae clearly distinguish this species from Trentepohlia , 

 and perhaps indicate an affinity with the Chaetophoraceae. 

 3. CEPHALEUROS Kunze in Fries, 1829, p. 327. 



Frond of a basal layer of branching filaments, in one or more 

 strata, with simple erect filaments, terminating either in a hair, 

 or in a sporangium or group of sporangia, sexual or asexual. 



Distinguished from Trentepohlia by the fuller development of 

 the horizontal disk, the reduced development of the erect fila- 

 ments and the presence of hairs. 



* Chroolepus moniliforme Nageli in Kiitzing, 1849, P- 895, is a lichen, 

 fide Hariot, 1889-90, p. 48. Wolle's plant, 1887, p. 123, PL CXV, figs. 

 30-33, appears to be the same. 



