ZOOLOGY AND BOTANY, MICROSCOPY, ETC. 419 



colourless. By heating to a temperature between 50° and 70° C, the 

 author determined that two or three pigments are combined in the 

 chromatophoreSj green with either blue or red or both. The green 

 pigment is identical with chlorophyll ; the red pigment appears also to 

 have a nitrogenous composition. 



Classification of Confervoideae.*— Prof. A. Hansgirg suggests the 

 following modifications of his previously published classification of the 

 Confervoideee. 



Under Trentepohliacese, the Hansgirgiaceae are separated as a distinct 

 family, comprising the genus Phycopeltis, which includes Phylladidium 

 Moeb.j Chromopeltis ex p., and Hansgirgia ; the family Mycoidaceae now 

 consists of Mycoidea alone. Under Confervacefe is included the family 

 Anadyomenaceae, consisting of the genera Anadyomene and Microdictyon. 

 Under Ulothrichacese, a new family Entocladiacese is proposed, made up 

 of the genera Entocladia, Endoclonium, Chsetonema, Bolhocoleon, JEpicladia, 

 and Pringsheimia (?). The genus Acrohlaste is sunk in Pilinia ; Poly- 

 chsete and Ochlochsete in Aphanochaete Berth. ; Chroolepus in Trentepohlia ; 

 and Ulothrix and Gloeotila ex p. in Hormiscia ; while Aphanocheete A. Br. 

 is referred to Herposteiron. 



Mycoidea, Hansgirgia, and Phyllactidium.-j- — Dr. G. B. de Toni 

 identifies Mobius's Phyllactidium tropicum,^ epiphytic on the leaves of 

 Orchidese, with his own Hansgirgia flabelligera,% found on the leaves of 

 Anthurium Scherzianum. The genus Phyllactidium Moeb. must be sunk 

 in Hansgirgia, which De Toni regards as a connecting link between the 

 Coleochsetacese, Trentepohliacese, and Mycoideaceas. 



M. E. De Wildeman || describes the fructification of both Mycoidea 

 and Hansgirgia, both genera being, he considers, rather widely dis- 

 tributed in the Tropics. He describes the organs of propagation in 

 both genera, and states that they are readily distinguished by their 

 habit and colour, the disc of Hansgirgia being, when fresh, orange, that 

 of Mycoidea green. The cells of the upright filaments differ also greatly 

 in size and form. 



Prof. A. Hansgirg ^ points out that two different genera have been 

 confounded under the name Phyllactidium. The genus of Kiitzing is a 

 section of Coleochsete, while that of Boreau and Mobius should be 

 included in Phycopeltis Mill., which forms the subfamily Hansgirgiacege 

 of Trentepohliaceae. 



Tilopterideae.** — Herr J. Eeinke has investigated the structure and 

 development of this very imperfectly known family of brown sea-weeds, 

 in which only three species are at present certainly included, Haplospora 

 glohosa, Scaphospora speciosa, and Tilopteris Mertensii, from the northern 

 and western coasts of Europe. 



Haplospora glohosa grows on stones and the shells of molluscs, 

 rarely on larger sea-weeds, in tufts, resembling in habit a Sphacelaria in 

 its lower portion ; each filament does not, however, end in a large apical 

 cell, but branches like an Ectocarpus, and ends in a hair-like prolonga- 



* Hedwigia, sxviii. (1889) pp. 14-7. Cf. this Journal, 1888, p. 776. 

 t Atti R. Accad. Lincei, 1888 (Rendic), pp. 221-3. 



X Cf. ante, p. 97. § Cf. this Journal, 1888, p. 1003. 



II Bull. Soc. R. Bot. Belg., xxvii. (1888) part i., pp. 119-26 (1 pi.), and OR. 

 Soc. R. Bot. Belg., 1889, pp. 34-7, ^ Hedwigia, xxviii. (1889) pp. 12-4. 



** Bot. Ztg., xlvii. (1889) pp. 101-18, 125-39, 155-8 (2 pis.). 



