ZOOLOGY AND BOTANY, MICROSCOPY, ETC. 465 



while the two lateral branches are shut off by septa, are club-shaped, 

 their apices form the superficial hexagonal facets, and each ends in a 

 hair. All the cell-walls are strongly doubly refractive. The axial 

 cell possesses a distinct power of apical growth. The order of formation 

 of the branches is acropetal. No nucleus or crystalloids could be 

 detected. 



The author then gives descriptions of other allied species and genera, 

 viz. Neomeris dumetosa Lira., Dasycladus Ag., Cymopolia barbata Lmx., 

 Acetabidaria Lmx., and Polyphysa Lmx. 



Dr. Cramer proposes to include the above genera under the family 

 Dasycladace/e, in which the primary axial cell is prolonged below into 

 rhizoids not separated by septa ; axial cell always sterile, lateral 

 branches fertile. These short branches are sporangia, which may either 

 produce directly gametes, i. e. conjugating swarm-cells, or spores, within 

 which the gametes are produced. The zygotes resulting from the con- 

 jugation of the gametes may give rise either to sexual or to spore-pro- 

 ducing individuals, exhibiting, in the latter case, an. alternation of 

 generations. The family may be divided into two sub-families, the 

 Acetabidariese and the Dasycladese. In the former are included the 

 following genera : — (1) Polyphysa (P. peniculus and Cliftoni) ; all the 

 fertile branches free to the base, forming a single whorl at the end of 

 the erect stem ; gametes unknown ; only known mode of reproduction 

 by spores. (2) Acetabularia (A mediterranea, crenulata, and Galycidus) ; 

 all the lateral branches completely united laterally into an umbrella- 

 shaped structure ; reproduction by conjugation of gametes. To the Dasy- 

 cladeaa belong : — (3) Dasycladus (D. clavseformis, australasicus, and occi- 

 dentalism ; club-shaped spongy plants ; axial cell usually simple and 

 torulose ; lateral branches branched ; all thick-walled ; reproduction 

 uncertain. (4) Neomeris (iV. Kelleri and capitata) ; axial cell always 

 simple ; lateral branches consisting of a fertile secondary branch (spor- 

 angium), and usually two greatly elongated sterile secondary branches ; 

 no production of gametes known. (5) Cymopolia (C. barbata) ; axial cell 

 segmented and dichotomizing repeatedly in one plane ; secondary 

 branches in whorls, and the upper whorls repeatedly branched ; repro- 

 duction unknown. 



New Genera of Phseozoosporese.* — Herr H. F. G. Stroemfelt de- 

 scribes two new genera of Pha30zoosporea3 from the coasts of Norway : — 



Microcoryne n. gen. Chordariacearum. Frons ex axi centrali hyalino 

 et filis periphericis endochromate largiore prseditis, pilis hyalinis inter- 

 mixtis, composita. Gametangia transformatione filorum peri phericor urn 

 orta, elongata, subcylindrico-fusiformia, unam tantum seriem loculorum 

 continentia. J\I. ocellata on Chorda filum. 



Phycocoelis n. gen. Ectocarpacearum. Frons o strato basili filis re- 

 pentibus formato et filis erectis inde exeuntibus, pilis hyalinis intermixtis 

 constituta. Gametangia transformatione filorum erectorum orta, unam 

 tantum seriem loculorum continentia. P. fecunda on Bhodymenia palmata. 



Tllothrix.t — M. F. Gay has followed the history of development of 

 several aerial species of Ulothrix, and has come, on some points, to 

 different conclusions from those of Hansgirg.f The species specially ex- 



* Notarisia, iv. (1888) pp. 381-4 (1 pi.), 

 t Bull. Soc. Bot. France, xxxv. (1888) pp. 65-75. 

 % See this Journal, 1885, p. 1037. 

 1888. 2 k 



