. Diatomaceæ of North America [microform] : illustrated with twenty-three hundred figures from the author's drawings on one hundred and twelve plates. Diatoms; Algae; Diatomées; Algues. % i\ ; i '11^ n. 30 3. I 2 - f I 5.^ t I I DIATOMAOE^ OF NORTH AMERICA. Valves hyaline; with a broad margin divided by simple rays; center hyaline, or granulate, reticu- late, or minutely punctate Mastogonia xc. All others Asterolampra xci. Family XV. (^oscinodisck/t:. Disc with a circle of large marginal or intra-mar- ginal cellules ; and radiate, or scattered cellules or punctae Heteiodictyon xoii. Valves not
. Diatomaceæ of North America [microform] : illustrated with twenty-three hundred figures from the author's drawings on one hundred and twelve plates. Diatoms; Algae; Diatomées; Algues. % i\ ; i '11^ n. 30 3. I 2 - f I 5.^ t I I DIATOMAOE^ OF NORTH AMERICA. Valves hyaline; with a broad margin divided by simple rays; center hyaline, or granulate, reticu- late, or minutely punctate Mastogonia xc. All others Asterolampra xci. Family XV. (^oscinodisck/t:. Disc with a circle of large marginal or intra-mar- ginal cellules ; and radiate, or scattered cellules or punctae Heteiodictyon xoii. Valves not Jis above 1 Disc with an interior ling of cellules separating the center from the broad marginal lim ; cellulation of center, curved or spiral P'• igMicellia xviii. Valves not as above 2 Disc very convex, or conical in f. v. ; with a con- spicuous, central pseudo-opening Porodiscus xciv. Valves not as above ,'{ Disc cellulose ; large, with a broad border of a differ- ent stru(^ture, separated by a well defined margin. (^KASPEDODISUUS XCV. Valves not as above 4 Disc hyaline; with distinct umbilicus, and (very) finely mark^'d ; with rayed or decussating lines,... HYALODISt'US XCVI. Probably otleji valves of Podosika—Melosira lxxii. Valves not as above 5 Disc cellulose; with a narrow (somewhat dentate) rim; connecting zone cellulose ENDK'TVAr-MEhOHIKA l,XXII. Valves riot as above (J Disc without marginal spines, teeth, or pseudo- nodule ; usually of small or medium si/t; : and generally with an outer ring-like portion either smooth or striate; center often bullate, smooth, or granulate; granulas equal, scattered, or rayed, or disc hyalin*' or finely punctate), with strong linear straight rays xovii. Valves not as above 7 Fiustules complex? disc circular, gen«!rally with a marginal oi- submarginal pseudo-nodule (sometimes absent) ; fre<pu'ntly with minute marginal spines or teeth ; and with a single or double series of radiating dots or punctate often subula
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectdiatoms, bookyear1890
