I 0LUN8 wi» Hi RVET. 



Pamili BELMINTHO LADIACEAE. 

 A< bo h a i in m Nageli. 



A conservative course has been followed by us in regard to the 

 plants belonging to this genus. No such richness of new forms has 

 been found here a> by Borgesen in tin- Danish West Indies, but we 



cannot claim to have made as thorough a study as he has, and 

 very unlikely that all the Bermuda forms have been discovered and 

 listed. We include under Acrochaetium the marine species formerly 

 passing under Chantran&ia, many of which have recently been jugg 



hack and forth, only too often. 



1. Original spore remaining niaziif est at base of filament. 2. 



1. Original spore not di<tin,L r ui<hal>le. 5. 



2. Basal cell with descending endophytic and erect free filament-. 3. 



2. No descending endophytic filament-. }. 



3. Cells 8-10 p diam., 4-"> diam. 1- 3. A. corymbiferum. 



3. Cells 12-14 /* diam., 2-3 diam. long. 4. A. barbad 



4. Cells short. Bubspherical. 2. A. Brassipes. 



4. Cells long, cylindrical. 1. A. Dufourii. 



5. Frond arising from a di>k. - A. Thuretii. 



.". Frond not arising from a disk. 



6. Horizontal filaments on surface of host. 7. 



Horizontal filaments endophytic only. 9. A. Hypnae. 



7. Horizontal filaments producing endophytic branch* 



7. A. Nemalionis. 

 7. Horizontal filaments without endophytic hran s 



8. Erect filaments 6-12 /* diam. 6. A. Sagraeanum. 



Ereci filaments 4r-5 n diam. 5. A. leptonema. 



1. A. Dufoukd Collins, P. B.-A., No. 1594; Chantranria Dufourii 

 Collins, 1911, p. 187; P. B.-A., No. 2087. Od Dictyota ciliata, Hungry 



Hay, Dee., Ilervey. Forming a dense fringe on the edge of the host. 

 The basal cell 'original spore) remain- distinct, attached to the host 

 by a circular disk, of diameter Larger than that of the cell. This 

 development is of the same character a- that in ('huntniuxiu coUopoda 

 Rosenvinge, 1509, p. 81, but On a smaller scale; it i- found also in 

 another Bermuda 1. cra8si\ 



2. A. CRASSiPEs Borgesen, I'd"). p. _'(>. fig. 11: Chantransia eras- 

 dpes Borgesen, 1909, p. 1, ficr. 1; P. B.-A., No. 2033. On Ceramium 

 davulatum and Polysiphonia ferulacea, St. David's Island, Feb., and 

 on CallUhamnion Hookeri, Gravelly Hay. April, Ilervey. 



