86 



Nemalion^. Several questions connected with that just mentioned deserve a closer 

 examination, thus, the cytological behaviour of the monosporangia of Ch. efflorescens 

 in comparison with that of the tetrasporangia of the same species, further the nuclear 

 division of the tetrasporangia in the non-sexual species. 



The following classification of the species is based in particular on the cha- 

 racters of the basal part and of the chromatophore. Ch. efflorescens, however, which 

 differs from the others in several characters, as mentioned above, is first separated 

 as representing a particular sub-genus, Grania, named after the Norwegian investi- 

 gator who first described its sex-organs, and lo the same sub-genus is referred Ch. 

 pectinata, with similar chromatophores and probably related to it. 



Key to the Danish species of Chantransia. 



I. Subg. Euchantransia. One chromatophore, carpospores only in the last cell 

 of the sporogenous filaments. 

 1. Frond epiphytic. 



2. A single basal cell. Group I. 

 3. With sex-organs. 



4. Antheridia situated on the carpogonia or on unicellular 



branchlets 1. Ch. gynandra. 



4. Antheridia never situated on the carpogonia. 



5. Antheridia singly or two together, cystocarps with 



few carpospores; monoecious 3. Ch. hallandica. 



5. Antheridia usually in fiat triangular clusters, cysto- 

 carps nearly globular with numerous carpospores; 



dioecious 2. Ch. rhipidandra. 



Without sex-organs. 



4. Pyrenoid parietal 1. Ch. gynandra. 



4. Pyrenoid axile. 



5. Cells nearly cylindrical. 



6. Filaments 9 — 1 l/Hhick, spor. 14 — 15x9 — lO/j. 2. Ch. rhipidandra. 

 6. Filaments at most 7 « thick. 



7. Filaments 5 — (Sfj. thick, sporangia 10 x 6— 7/^! 3. Ch. hallandica. 

 7. Filaments 6 — 7// thick, sporangia 12 — 16 x 



8--10 II 4. Ch. baltica. 



5. Cells roundish, frequently barrel-shaped 5. Ch. moniliformis. 



2. Basal layer multicellular. Group II. 



3. Basal layer composed of filaments more or less fusing 

 together into a pseudoparenchymatous disc. 

 4. Erect filaments well developed; pyrenoid parietal. 

 5. Erect filaments branched. 



6. Branches scattered; monospores, rarely tetraspores. 



' Comp. J. .I.WoLFH, Cytolog. Stud, on Nemalion, Ann. of Botany Vol. 18 Oct. 1904. 



