520 RHODOMELACEAE. 



succulent, more irregularly branched, and more intricately intertangled than 

 are those of the genus Laurencia. Apparently endemic. 



Chondria polyrhiza Collins & Hervey, is somewhat like the foregoing in 

 general habit, but is rather larger, more dusky red, even more irregular in its 

 branching, more intertangled in habit of growth, and its ultimate ramuli are 

 taper-pointed. It lacks the conspicuous thickened crescentic transverse in- 

 ternal septa of C. curvilineata, though it often shows somewhat similar longi- 

 tudinal or irregularly disposed thickenings, and it develops frequently ventral 

 or latero-ventral multicellular haptera, indicating a creeping habit. (Phyc. 

 Bor.-Am. 2040.} Apparently endemic. 



Acanthophora spicifera (Vahl) B0rg. is common in shallow bays, tidal 

 streams, and tide-pools (Phyc. Bor.-Am. 1938). It grows usually 3 to 8 inches 

 tall, is a dusky red or purple when living, often blackens on drying, is irregu- 

 lar and often sparing in its main ramification, and the wand-like main branches 

 are clothed with more or less 4-ranked subulate ramuli, mostly A-2 lines long, 

 which are beset with minute, single or clustered, patent or reflexed spine?. 



Digenea simplex (Wulf.) Ag. is a shaggy, rigid, tawny- or dingy-red, 

 rather unattractive, irregularly dichotomous plant that commonly grows 1-4 

 inches high, being found especially in tide-pools and on sand-covered rocks 

 near the low- water line, as along the South Shore (Phyc. Bor.-Am. 1939}. 

 The branches, particularly in their upper parts, are more or less densely clothed 

 with mostly simple rigid filaments that are usually 1-4 lines long and that 

 appear transversely segmented under a hand-lens. The main branches, thus 

 clothed, are sometimes suggestive of fox-tails or of Lycopodium Selago. 



Polysiphonia ferulacea Suhr, is probably the most common of the several 

 Bermudian Polysiphonias that have four pericentral siphons. Its filaments 

 are more or less rectangular-prismatic and its segments are often shorter than 

 broad. The plant is commonly 1-4 inches high, tufted in habit, rather spar- 

 ingly branched, subpellucid when living, and brownish red or fuscescent on 

 drying. It grows in tide-pools and on rocks and stones just below the low- 

 water line. It prefers somewhat agitated water, as on the rocks at Hungry 

 Bay. (Phyc. Bor.-Am. 1940.} 



Polysiphonia havanensis Mont, is also a 4-siphoned species. It is more 

 slender, softer, and more gelatinous than the preceding, and its segments are 

 more terete and are relatively longer, the median and lower being often 2-3 

 times as long as broad. It is usually found in association with mangroves, 

 near the low-water mark. (Phyc. Bor.-Am. 1941.} 



Pol i/sipJio nia macmcurim Harv. is a name that has been adopted in the Phyco- 

 theca (Phyc. Bor.-Am. 2093) for an extremely slender and delicate 4-siphoned species 

 found coating the roots of mangroves between the tide-lines at Hungry Bay. It dif- 

 fers specifically, however, from the Irish plant to which Harvey gave this name in 

 its more slender, more sparingly and more dichotomously branched filaments, its 

 shorter segments, its violet-red 'color, etc. The only specimen examined was ap- 

 parently sterile. 



Polysiphonia foetidissima Cocks, has 7-9 pericentral siphons and seg- 

 ments mostly 1-2 times as long as brOad. It is commonly 2-5 inches high and 



