50 



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



Fig. 50. Acrochætium hormorhizuin nov. 

 spec. Base of a plant. (About 250:1). 



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

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

 St. Jan: Off Cruz Bay. 



17. Acrochætium hormorhiziim 

 nov. spec. 



Thallus cæspitosus 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- 

 teriorem partem membranæ 

 cellularum hospitis {Champiæ 

 parvulæ) penetrantia, ex cellu- 

 lis brevibus pariete crassiori 

 composita, discum basalem minorem supra ceilulas maximas 

 hospitis formantia. 



E disco basali 

 fila erecta creantur, 

 ramis numerosis plus 

 minus ramosis sparsis 

 in superiori parte filo- 

 rum uniseriatis. 



Cellulæ in inferi- 

 ori parte filorum dia- 

 metro fere 4 — 5-plo 



longiores, 9 — 11 // 

 latæ , in superiori 

 parte 8 — 9/^ latæ dia- 

 metro fere 7-plo lon- 

 giores. 



Chromatopho- 

 rum p'arietale, pyre- 

 noide laterali muni- 

 tum. 



Sporangia sessi- 

 lia aut rarius pedicel- 

 lata, sparsa aut pluria 

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



This species was found on Champia parvula upon which it 

 forms small cushions about 1 mm high. 



Fig. 51. Acrochætium hortnorhizum nov. spec. 



a, habit of a plant, b, filaments with sporangia. 



c, base of a plant seen from above, (a, about 



70: 1; b, 150: 1; c, 250: 1). 



