258 THE MARINE ALGJK OY SOUTH CAROLINA AND TLORIDA. 



represented at (1) and (2). A vertical section of the thallus (4) shows 

 the immersed and imbedded apothecia darker at the surface, and with 

 a colourless hypothecium. The contents of the apothecium consist of 

 colourless closely packed flocculose filaments or paraphyses (6), amidst 

 which are imbedded the rotundo-pyriform asci (5), each containing 

 eight spores, colourless (or in a dead state fuscous), narrowly obovate 

 or clavate, three- or four- septate, the uppermost cell being larger and 

 occupying nearly one half of the spore, the septa being confined to 

 the lower portion (7). I could not detect any spermogonia. The 

 thallus gave reaction K yellow, C yellow ; medulla white I yellow- 

 ish ; gelatina hymenea I no reaction perceptible. 



The following may serve as a diagnosis to distinguish it from 

 allied species, such as S. venosum, S. HutchinsKe, and S. crassum. 



Stigmatidium dendriticum, Leight. Thallus whitish or cream- 

 coloured, thin, tartareous, smooth, effuse (K yellow, C yellow) ; apothe- 

 cia lirellcBform, black, i?i7iate, irregularly and variously branched in a 

 dendritic or radiate manner, plane, naked, immarginate, internally pale ; 

 spores 8, colourless, narrowly obovate or clavate, 3- or 4-septate, upper 

 cell larger. 



Explanation of Tab. 166. 

 1. Thallus of S. dendriticum, natural size. 2. The same mag;nified. 3. In- 

 ternal contents of thallus, magnified. 4. Vertical section of thallus, magnified. 

 5. Asci and spores, magnified. 6. Flocculose filaments of apothecium, magnified. 

 7. Spores, magnified 1200 times. 



NOTES ON THE MAEINE ALG^ OF SOUTH CAROLINA 

 AND FLORIDA. 



By J. Cosmo Melvill, M.A., F.L.S. 



Having passed the winter of 1871 and the spring and summer of the 

 following year principally at Charleston, South Carolina, I had fre- 

 quent opportunities for exploring the harbour, Sullivan's Island, &c., 

 in search of Algae. It is well known that south of Cape Cod to South 

 Florida there is no such good locality as the breakwater upon Sulli- 

 van's Island, opposite Fort Moultrie. 



The whole of March, 1872, was spent, either on the west coast of 

 Florida, which is sandy and unproductive of Algae, or at Key "West. 

 It is needless to expatiate upon the richness of the Marine Flora of 

 this island, visited first by the late Dr. "W. H. Harvey in 1850, who 

 has described most of the Algae in his ** Nereis Boreali- Americana." 

 Professor W. G. Farlow also has recently issued a revised list of all 

 species known to occur upon the shores of the U.S.A., and records in 

 his preface, " whatever may be said of the poverty of the eastern coast, 

 Key "West outranks even the famous Biarritz for number of species. 

 It is curious to notice the very large per-centage of species in the fol- 

 lowing list which occur there." The total number catalogued is 430, 

 of which 160 occur at Key "West. 



Of these I observed over 100 species mentioned in the list, and, 

 a few others, which I have submitted to Prof. J. G. Agardh, of Lund, 

 to whom I am very much indebted for kind assistance in determining 



