32 



Fig. 25. Acrochsetium seriatum nov. spec. 



a, b, erect filaments with monosporangia. c, base 



of a small plant seen from above, d, transverse 



section of the base; the lines at both end are 



the surface of the host plant. 



(a, b, about 130:1; c, 400:1; d, 275:1). 



Fig. 26. Acrochsetium 



Rosenv.; but to judge 

 from the figures of 

 ROSENVINGE the habit 

 of his plant is very 

 different from the 

 mine. Further the 

 filaments in his plant 

 are only half as broad 

 as those in my plant 

 and the sporangia 

 also are somewhat 

 smaller. 



Only found once: St. 

 Thomas, The Harbour. 



8. AcrochaBtium 

 seriatum nov. spec. 



Thallus csespitosus 

 usque ad 1 mm altus 

 e disco basali in fila- 

 mentis hospitis epi- 

 phytico et filis erectis 

 ramosis constructus. 



Discus basalis uni- 

 stratosus,e filis repen- 

 tibus confluentibus, 

 cellulis brevibus fere 

 isodiametricis irregu- 

 lariter formatis com- 

 positus. Fila erecta a basi quoquoversum 

 ramosa in superior! parte secundatim ra- 

 mosa, ramis principalibus vix, minoribus 

 plus minus ad apicem versus attenuatis. 



Cellula? in parte basali ca. 22 p Ionga3, 

 diametro ca. 8 10 /j. lato, in superior! parte 

 diametro ca. 6 7//, interdum 4^ lato. et 

 ad 30 n longae, chromatophorum parietale 

 lobatum, pyrenoide laterali instructum 

 continentes. 



Sporangia ovalia, 9 10 13 ^ longa et 



seriatum .nov. spec. Base 6 9 lata, sessilia aut interdum pedicel- 



of a plant seen from , ' . . . 



above. (About 400:1). lata, in latere supenon ramorum plerum- 



