68 



D 



j: 



dividing into Iwo , the one lying over the other at the one side of the cell. Then 

 the chromatophore divides after a longitudinal plan into two of unequal size lying 

 side by side (Fig. 8 D); the larger later moves upwards and is taken up in the 

 spore together with the upper nucleus (Fig. 8 E, F). In the lower chromatophore 

 the pyrenoid is very small and indistinct shortly after the division, while the upper 

 contains a large and distinct pyrenoid; it is therefore probable that the original 

 pyrenoid passes undivided over into the larger chromatophore, while a new pyrenoid 

 is formed in the smaller. The fructiferous cells contain many small starch-grains 

 which stain dark-violet with iodine; they are to be found in the sporangia as well 

 as in their sister-cells. The sporangium is in general smaller than its sister-cell; 



when the mother-cell is very short, however, they 

 can be of equal size or even larger. As shown by 

 Thuret and Bkrthold, the under-lying cell, after 

 the evacuation of the spore, expands and occupies 

 the place of the original mother-cell, and the pro- 

 cess of spore-formation may be repeated. 



The plant has been found in almost all Danish 

 waters excepted the Baltic, as a rule, however, only 

 in small quantities and therefore not conspicuous. 

 In greater quantity onl}' found at Struer, in the 

 Limfjord, (Sept. 1890) and in the harbour of Frede- 

 rikshavn (particularly in August 1891 and July 

 1896). It is a summer Alga, nearly exclusivel}' met 

 with in the months July to September; it has how- 

 ever also been collected in winter (Nov. and Jan.). 

 It has been found fructiferous in all the months 

 named. It does not like much agitated water; it 

 has been found most frequently and in greatest 

 quantity in harbours, on piers and the like, in 

 small depths, but it has been found down to 19 

 meters. It is always epiphytic and has been found 

 growing on a number of dilferent Algae, e. gr. Polysiphonia niyrescens and violacea, 

 Ceramium nibrum, Brongniartella, Bryopsis, Porphyra iimbilicalis and many others. 



Localities. Sk: SY, off Leklien, 13 meters. Lf: Harbour of Struer; Sallingsund, at Glyngerc 

 and off Snabe, 4— (i meters; I>S, off Arnakke, 7 meters; MI, off Ejerslev, 4 meters. — Kli: Herthas Flak, 

 19 meters, (Borgs.): harbour of Frederikshavn ; Borrebjergs Rev; Nordre Banner; GM, 6 meters. — Km: 

 BL, 9,5 meters; BH, off Gjerrild Klint, 4 meters. - Ks: Holbsek Fjord. — Sa: Kal0 Rev; Hofmansgave 

 (Lyngbye. Hofm. Bg.). - LI): Harbour of Middelfart. — Su: BQ, off Ellekilde, 5,5 meters; PZ, E. of Hveen. 



Enjthrotrichia carnea. .1— C, yountJ plant 

 ;md bases ol' phuits attaehed to Poiphyr:i. 

 liSO:!. D-F, Iriictileioiis cells; in D the 

 cluomatoplidrL' and the nucleus have re- 

 ccnlly divided, in E and F the sporangial 

 cell lias been cut off. 412:1. 



Porphyropsis gen. nov. 



Parous initio pulvinata parenchymatica , dein vesiculosa et ruptura in meni- 

 branam monostromaticain expansa. Sporse (gonidia), ut in Erythrotrichia, divisione 

 obliqua in cellulis frondis gignuntur. Reproductio sexualis ignola. 



