196 



Dansk Botanisk Arkiv, Bd. 3. Nr. 1. 



When growing upon stones etc. it forms small dense, roundish 

 tufts upto 1 — 2 cms. high, when epiphytic it often covers the 

 host plants quite densely. 



The thallus is slender (Fig. 184). In the basal part of more 

 vigorous plants its diameter reaches about 100 rarely up to 150^«, 

 upwards it grows thinner and in the uppermost thin filaments 

 the diameter reaches only a length of about 30 — 60/^. The thallus 

 is repeatedly dichotomously ramified (Figs. 184 — 185). At the 

 base of the branches a node is always found. The distance bet- 

 ween the ramification is of very variable length, now long and 

 now short, but, when long, the thallus is divided by nodes in 

 nearly equally long joints. The length of the joints varies from 

 5 — 8 times their breadth. 



Fig. 186. Jania adhaerens Lamx. Basal parts of filaments with flat, roun- 

 dish attachment discs. (About 60:1). 



The cells in the nodes are about . 200 n long and 7 fx thick ; 

 in the joints 3 — 5 rows of long cells are mostly found ; these 

 have nearly the same length as those found in the nodes. 



In the basal parts of the thallus I have found a few times 

 some small attachment discs (Fig. 186); those are mentioned by 

 Yendo in his paper: "Corallinae verae Japonicae (Journ. of the 

 College of Science, vol. 16, part 2, p. 24, Tokyo 1902). 



Nearly all the specimens I have come across are sterile ; some 

 few tetrasporic specimens were found growing epiphytically upon 

 Digenia (Fig. 187). The conceptacles are urnshaped ; they are 

 developed from the basal cell in the upper dichotomies and 

 provided with two long branchlets often several times articulated. 

 The conceptacles are about 300;/ long and of nearly the same 

 breadth. 



