. A handbook of cryptogamic botany. Cryptogams. CONFERVOIDEM JSOGAM^ 279 Hansgirg (Bot. Centralblatt, 1885) believes that the filamentous genera placed in this genus are connected genetically with forms classed under the ChEtophoraceae, Siphonocladaceae, and Ulvacese. To this order belong also Hormidium (Ktz.) and Schizogonium (Ktz.). Wildeman (Biill. Soc. Bot. Belg., 1886, p. 7) traces a genetic connection between Ulothrix and Pleurococcus. Literature. Crar^er—Vierteljahrschrift Nat. Gesell. Zurich, 1870. Cienkowski—Mel. biol. Bull. Acad. St. Petersbourg, 1876, p. 531. Dodel-Port—Pringsheim's
. A handbook of cryptogamic botany. Cryptogams. CONFERVOIDEM JSOGAM^ 279 Hansgirg (Bot. Centralblatt, 1885) believes that the filamentous genera placed in this genus are connected genetically with forms classed under the ChEtophoraceae, Siphonocladaceae, and Ulvacese. To this order belong also Hormidium (Ktz.) and Schizogonium (Ktz.). Wildeman (Biill. Soc. Bot. Belg., 1886, p. 7) traces a genetic connection between Ulothrix and Pleurococcus. Literature. Crar^er—Vierteljahrschrift Nat. Gesell. Zurich, 1870. Cienkowski—Mel. biol. Bull. Acad. St. Petersbourg, 1876, p. 531. Dodel-Port—Pringsheim's Jahrb. wiss. Bot., 1876, p. 417; Bot. Zeit., 1876, p. 177. Gay^-BuU. Soc. Bot. France, 1888, p. 65. Hansgirg—Flora, 1888, p. 259. Order 4.—Chroolepide^. This order, as constituted by Borzi, comprises a small group of algae found on damp walls, the trunks of trees, and similar situations, not unfrequently imbedded in the thallus of lichens, or constituting their gonidial element. The thallus consists of a branched or unbranched filament of cells, usually somewhat rounded or mo- niliform in outline, and is distinguished by the mask- ing of the colour of the chlorophyll by a golden yellow, orange, or red oily pigment, soluble in alcohol and imparting a strong odour of violets. This pig- ment, which occasionally occurs also in other lowly organised algae and proto- phytes, has been examined by Rostafinski, and found to be a derivative of chlo- rophyll to which he gives the. name chlororufin. Microzoospores or zooga- metes and megazoospores are produced in gametanges or zoosporanges, which are indistinguishable from the vegetative cells except by their somewhat larger size, and which are either terminal or intercalary. Conjugation of the. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Bennett, Alfred
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