MARINE ALG^E OF BEAUFORT, N. c. 555 



PLATE CXII: i. Halymenia decipiensXi/3 circ. 2. Halymenia floresiaXi/2 circ. 3. Halymenia gelinaria 

 X3/S- 4- a, Halymenia gelinariaX 3! 7 circ.; b, Halymenia fioridanaX 3! 7 circ.; c, Amphiroafragilis- 

 simaXslj circ. 5. Undetermined species, No. 1X9/16. 



PLATE CXIII: i. Grateloupia filicinaXSli* circ. 2. Grateloupia gibbesiiXi/3 circ. 3. Cryptonemia 

 crenulataX6/ii. 4 and 5. Corallina cubensis. 4. Xi/i. 5. X 1 1/3. 



PLATE CXIV: i, 2, and 3. Padina -vickersice; i, cross section of thallus and oogonial sorus, oogonia 

 almost mature; 2, cross section of thallus and tetrasporangial sorus, showing undivided tetraspo- 

 rangia; 3, cross section of thallus and antheridial sorus, antheridia almost matureXaya. 4. Nito- 

 phyllum medium, type, cross section of thallus showing, below, edge of soral thickening composed 

 of three cell layers, three veins shown cut across; the central one has adjoining portion of thallus 

 three cells deep with irregular thickenings on wallsX272. 5. Nitophyllum medium, cross section 

 of tetrasporangial sorus, showing soral thickening, undivided tetrasporangia, and veinsXsyz. 

 6. Corallina capillaceaX 50, 



PLATE CXV: i to 9. Pfuzostroma pusillum; i, margin of thallus, showing separate creeping filaments, 

 plurilocular sporangia, hair, etc. X245; 2, enlarged detail, showing immature plurilocular sporangium, 

 chromatophores, etc. X 1040; 3, mature plurilocular sporangium in obliquely longitudinal viewX67o; 

 4, mature plurilocular sporangium viewed from above (end view) X 670; 5, margin of thallus (more 

 compact than that shown in fig. i), with unilocular sporangia, a sorus at a and the beginning of a 

 sorus at 6X245; 6, enlarged detail of thallus, showing chromatophores and unilocular sporangia 

 as seen from aboveXio4o; 7, young unilocular sporangium viewed from aboveXio4o; 8, the begin- 

 ning of a sorus viewed from above X 1040; 9, a mature sorus of unilocular sporangia viewed from 

 above X 1040. 10 to 16. Derbesia turbinata; 10, apex of thallus showing a young lateral branch X8i; 

 n, lateral or unequal dichotomous branchingXSi; 12, dichotomous branchingXSi; 13 to 16, usual 

 forms of sporangia X 1 62, 13 and 15 showing pedicel cells. Drawings by M. A. Howe, from Howe 

 and Hoyt, 1916. 



PLATE CXVI: i. Erythrocladia recondita on Dictyota dichotoma, photograph made after staining with 

 iodine, showing habit of plant and sporocarps (the larger darker cells) Xi6o. 2. Erythrocladia 

 vagabunda on Dictyota dichotoma, photograph made after staining with iodine, showing habit of 

 plant and sporocarps (some of the larger cells) Xi6o, a small colony of E. recondita with smaller 

 darker cells shown near B at the lower right-hand corner. From Howe and Hoyt, 1916. 



PLATE CXVI I: i to 5. Erythrocladia recondita; i, portion of thallus near margin viewed from above, 

 showing outlines of protoplasts and of pyrenoids with outlines of the cortical cells of its host X 670; 

 2 and 3, portions of cross sections of endophyte and its host, showing the immersed vegetative cells 

 and the more or less exserted spermatia (spm.)X67o; 4, portion of a cross section showing a carpo- 

 gonium with exserted trichogyneX67o; 5, portion of pseudoparenchymatous thallus viewed from 

 above, showing protoplasts of vegetative cells, spermatia (spm), carpogonium (cpg), and sporocarps 

 (spcp)X67o. 6 to n. Erythrocladia vagabunda; 6, portion of thallus viewed from above, showing 

 outlines of protoplasts and of pyrenoids with outlines of the cortical cells of its hostX4i5 ; 7, portion 

 of thallus showing three vegetative cells, six sporocarps (spcp), and five cavities from which carpo- 

 spores have been discharged X 670; 8 to 9, portions of thalli showing vegetative cells and sporocarps 

 (spcp)X4is; 10, a single carpospore lying on the surface of its host, in the outer walls of which it is 

 already partially immersedX67o; n, a young filament (four-celled stage) viewed from aboveX4i5. 

 12 to 17. Microchcete nana; 12, a young filament, prostrate, but beginning to turn upward at apex, 

 thickness of sheath slightly exaggerated X 670; 13, older and normally curved filament showing 

 two basal heterocysts (not common), thickness of sheath slightly exaggeratedX67o; 14, an unusually 

 straight, apparently mature filamentX245; 15, filament showing curve of a frequent formX24S; 

 16 and 17, apex and base of filament shown in fig. 15 X67O. Drawings by M. A. Howe, from Howe 

 and Hoyt, 1916. 



PLATE CXVIII: Acrochcetium infestans; i. Filaments of the usual form in the wall of a hydroid, with 

 two exserted filaments, only the protoplasts being shown in the immersed portions, since the cell 

 walls are almost invisible X 670. 2. An exserted sporangium sessile on an interior filament X 670. 

 3. An exserted filament of three cells, one being a sporangium and another probably an immature 

 sporangium X 670. 4. An exterior filament with short branches, short hairs, and a single lateral 

 sporangium X 670. 5. A single typical cell of an interior filament showing chromatophore, pyre- 

 noid, etc. X 1040. 6. Exterior filaments showing sporangia in terminal clusters and a single lateral 



