120 



usually monosporous; in some cases, however, the contents seemed to be divided 

 into two or four parts (fig. 46 A), but conclusive observations were not arrived at. 



On Polijsiphonia urceolata dredged near Hirshals I have found, growing in 

 company with other interesting Algse {Erythrocladia irregularis and subcontinua, Chan- 

 transia emergens), a small Chantransia which I believed at first to be a different 

 species, most of the rather few specimens consisting only of creeping filaments, 

 bearing sporangia either directly or on unicellular stalks (fig. 48). Later however I 

 found other specimens with numerous erect, partly sporangia-bearing filaments fully 

 agreeing with the above described specimens growing on Chondrus, and 1 therefore 

 have no doubt that they belong to the same species. The dimensions were the 

 same; I found however that the sporangia borne directly on the basal layer were 

 somewhat shorter, 8 — 9 w long, 6/^ broad, perhaps only because they were not fully 



ripe. The chromatophore showed the same ap- 

 pearance as in the specimens from Hanstholm, 

 but the pyrenoid appeared not to be central; 

 as the material from both localities was only 

 dried, the question must however be left open. 

 In some fairly juvenile plants I succeeded in 

 finding that the first divisions of the germina- 

 ting spore take place in a similar manner as 

 in Ch. virgatula, three peripheral cells being cut 

 off round an inner triangular cell (fig. 48 B). 



This species appears to be distinct from all 

 hitherto described species especially by its mode 

 of growth and its slight thickness. Ch. chiloensis 

 Reinsch (Contrib. ad Alg. et Fung. Vol. I 1877 p. 37 

 Taf. XI fig. 1) which was found at St. Thomas, 

 West Indies, growing on Acanthophora Thierii, 

 difTers according to Reinsch by the greater length 

 and thickness of the filaments, by the short creeping filaments consisting of shorter 

 cells and by broader sporangia. 



Localities. Sk: Hanstholm, Roshage, on Chondrus crispus in 2 m. deptli, YU*, August; XO, 

 Mellegrund off Hirshals, on Polgsiphonia urceolata, 11,5 to 15 m., August. 



Fig. 48. 



Chantransia leptonema. (Frnm XO). .4, creeping 

 filanienls on the sui liii e i>( PuLysiphonia urceolata, 

 bearing sporangia. li, fairly young plant seen 

 from above. C and D, plants seen in vertical 

 section, /J willi sporangia. .l—C 390:1. £), 730:1. 



15. Chantransia reducta sp. nov. 



Thallus filiformis ramosus repens substrato affixus. Spora germinans in cel- 

 lulas duas divisa est quarum vitraque filum repens procreat. Cellulse filorum 

 repentium leviter tumidse, c. 4 // cras.sse, longitudine diametro fere sequali vel ssepius 

 duplo longiores, chromatophorum parietale, pyrenoide fere axili munitum, conti- 

 nentes; utraque cellula demum superne sporangium aut filum brevissimum gerens. 

 Fila erecta 1 — 3-cellularia simplicia, rarissime ramosa, 4,5 — 6 fj. lata, cellulis dia- 

 metro fere aequilongis vel paullo longioribus, nonnunquam pilum hyalinum apicalem 



