50 



The sporangia are oblong, about 22 ^ long and 11 /j. broad. 

 Found once only in deep water (about 20 meters). 

 St. Jan: Off Cruz Bay. 



17. Acrochsetium hormorhizum 



nov. spec. 



Thallus ca?spitosus usque 

 ad 1 mm altus et ultra, e 

 filis endophyticis brevibus 

 horizontalibus ramosis et filis 

 erectis, a basi ramosis, spor- 

 angiferis constructus. 



Fila endophytica in ex- 

 ^^^^^^^_ I teriorem partem membranes 



Fig. 50. Acrochsetium hormorhizum nov. cellularum hospitis (Champix 

 spec. Base of a plant. (About 250 : 1). parvulx) penetrantia, ex cellu- 



lis brevibus pariete crassiori 



composita, discum basalem minorem supra cellulas maximas 

 hospitis formantia. 



E disco basali 

 fila erecta creantur, 

 ramis numerosis plus 

 minus ramosis sparsis 

 in superiori parte filo- 

 rum uniseriatis. 



Cellules in inferi- 

 ori parte filorum dia- 

 metro fere 4 5 - plo 



longiores, 9 11 // 

 latse , in superiori 

 parte 8 9// latse dia- 

 metro fere 7-plo lon- 

 giores. 



Chromatopho- 

 rum parietale, pyre- 

 noide laterali muni- 

 Fig. 51. Acrochsetium hormorhizum nov. spec. 



Sporangia sessi- a, habit of a plant, b, filaments with sporangia. 



lia ant rariiis nprlirpl c > base of a P lant seen from above - ( a > about 

 ' P e 70:1; b, 150 : 1 ; c, 250: 1). 



lata, sparsa aut pluria 



seriata, oblonga, fere 20 22 n longa et 10 11 /j. lata. 



This species was found on Champia parvula upon which it 

 forms small cushions about 1 mm high. 



