F. Borgesen: List of species. 



435 



8. Ectocarpiis breviarticulatiis J. Ag. 



9. 



clachistæformis Heydr. 



Of this plant I have come across some 

 more material, and I am able to make some 

 additions to my former description, vol. I, 

 p. 174. 



In its basal part not only horizontal 

 filaments are present, as shown in Fig. 137 a, 

 but also more or less vertical short ones (Fig. 

 411 a). These are growing down in the tissue 

 of the host. They are mostly rather thick, 

 about 20 ^i thick and composed of short cells 

 in which chromatophores are present. 



The upper cells of the assimilating fila- 

 ments are often nearly colourless, but their 

 summits are mostly obtuse. The uppermost 

 cells reach a length of about 70 fji. 



Upon the assimilating filaments from near 

 their base and rather high up. short pluri- 

 locular sporangia occurred (411 b). These are 

 mostly short, proportionally thick and sessile, 

 they are about 12 fi broad and 25 — 35 up 

 to 70 // long. 



The common plurilocular sporangia, found 

 at the base of the plant, often reached a 

 length of more than 170 /u. 



In one plant a supposed unilocular spor- 

 angium was found (Fig. 411 b). It was ovate 

 of shape, placed terminally upon a short stalk 

 composed of short cells. The sporangium was 

 50// long and 28 fi broad; the cells in the 

 stalk 11 (i broad. 



Fig. 411. 

 Ectocarpus elachistse- 

 formis Heydr. a, part 

 of the base of a plant. 

 b, part of plant with 

 unilocular sporangi- 

 um and plurilocular 

 sporangia up along 

 the assimilating fil- 

 ament, 

 (a, about 200:1; b, 

 150:1.) 



AsCOCycluS Magnus. 



10. Ascocyclus Hypneæ nov. spec. 



Fila basaha endophytica inter cellulas externas hospitis, 

 Hypneæ musciformis, repentia, ex cellulis brevibus composita; 



28* 



