436 



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



hæc pilos, ascocystos et sporangia erecta extra hospitem surgentia 

 gignunt. 



Ascocysti clavati, ca. 65 fi longi et 10—16 // lati. Pili longi; 

 articuli eorum in parte basali breves, ca. 6 fi lati, in superiori 

 parte longi, ca. 180 // et crassiores, ca. 16 \i lati. Sporangia pluri- 

 locularia ex pediculis brevibus surgentia, oblonga-fiisiformia, 

 ca. 16 — 26 fi lata et 65 // longa. 



Upon a specimen of Hypnea miiscijormis a small, partly en- 

 dophytic brown alga was found which I think can be referred 



to the genus Ascocyc- 

 lus, having those bo- 

 dies, named ascocysts 

 by Sauvageau (Myrio- 

 nemaceæ, p. 9), chara- 

 teristic of the genus« 



The base of the 

 plant (Fig. 412 a, h) 

 consists of filaments 

 creeping among the 

 peripheral cells of the 

 Hypnea. The. cells in 

 these filaments are 

 rather irregularly shap- 

 ed, often swollen in 

 their middle. They reach a breadth of about 7—8 p. From these 

 cells arise: 1) the ascocysts, 2) the hairs and 3) the sporangia. 

 Characteristic for all three organs is that they are rather thin 

 at their start from the creeping filaments, but gradually, as they 

 approach the periphery of the host plant, they become thicker 

 (comp. Fig. 412). 



The ascocysts are clavate in shape; from a slender base 

 they increase gradually upwards until near their apices which 

 are broadly rounded. They are about 65 p long and their diameter 

 reaches a length of about 10 — 16 p. They may arise directly from 

 a cell in the creeping filament or have a few short cells at their 

 base. They have thick walls and their contents seem rather homo- 

 genuous and of a dark brown colour in spite of the plant having 

 been preserved in alcohol. 



The hairs have a growth zone near their base ; here the cells 



Fig. 412. Ascocyclus Hypneæ nov. spec. 

 a, b, c, parts of the plant. (About 150:1. 



