March, 1920] MORPHOLOGY, ETC., OF ALGAE 101 



"compression wood" and normal wood of dicotyledons. The geotropically produced wood of 

 ring-porous dicotyledons, on the other hand, is characterized by pi ing relatively more 



"latewood" and wider vessels than normal tissue. The structural changes which occur 

 during geotropic and hcliotropic bending are briefly discussed. [See Bot. Absts. 3, Entry 826.] 

 —7. W. Bailey. 



692. Garber, It. J., and P. J. Olsen. A study of the relation of some morphological 

 characters to lodging in cereals. Jour. Amer. Soc. Agron. 2: 173-187. Fig. 1-2. 1919. — 

 See Bot. Absts. 3, Entry 468. 



693. Parrott, P. J., H. E. Hodgkiss, and F. Z. Hartzell. The rosy aphis in 

 relation to abnormal apple structures. New York Agric. Exp. Sta. [Geneva] Tech. Bull. 66. 

 29 p., 8 pi. (2 colored), 6 fig. 1919.— See Bot. Absts. 3, Entry 783. 



MORPHOLOGY AND TAXONOMY OF ALGAE 



J. R. Schramm, Editor 



694. Bristol, B. Muriel. On the retention of vitality by algae from old stored soils. 

 New Phytol. 18: 92-107. Fig. 1-2. 1919. — Fifteen samples of soil from the experimental 

 plots at Rothamsted (England), which had been sealed at various times from 1846 to 1893, 

 were examined for living algae. A culture fluid was inoculated with the soils in 1916. After 

 a short time green algae developed, and later blue green. The identification of species wa3 

 rendered difficult by the fact that most of the forms appearing in cultures were not exactly 

 identical with known species. Notes of each species mentioned record these variations 

 from the type. In the following list of species, the numbers following each name indicate 

 (1 ) the number of samples from which it was recovered, and (2) the number of years it lived in 

 dry soil. Nostoc muscorum Kiitz. (7-70), N. Passer inianum Bornet et Thuret (1-59), N. sp. 

 (3-59), Anabaena laxa (Rabenh.) A. Br. (?) (2-46), A. oscillarioides Bory forma (4-59), Nodu- 

 laria Harveyana (Thwaites) Thuret (1-70), Cylindrospermum licheniforme (Bory) Kiitz. (2-59), 

 Plectonema Battersii Gomont (4-47), H apalo siphon flexuosus Borzi forma (?) (4-47), Phormid- 

 ium tenue (Menegh.) Gomont (1-47), Trochiscia aspera (Reinsch) Hansg. (4-48), Chlorococ- 

 cum humicola (Naeg.) Rabenh. (11-59), Stichococcus bacillaris Naeg. (3-48), Nitzschia Palea 

 (Ktz.) W. Sm. (1-48). — A new variety (terrestris) , with two new forms (major and minor) 

 of Anabaena oscillarioides Bory is described. — The degree of dryness of the stored soil appears 

 to affect the longevity in some cases. — I. F. Lewis. 



695. Carter, Nellie. Trachelomonas inconstans, a new flagellate. New Phytol. 18: 

 118-119. Fig. 1. 1919. 



696. Groves, James. Notes on Lychnothamnus. Jour, of Bot. 57: 125-129. 1919.— 

 The author discusses a charophyte raised from mud collected in Cape Colony, and concludes 

 that it is L. macropogon, Braun, an Australian species, heretofore not known from Africa. 

 The status of the generic name Lychnothamnus is discussed, it being shown that L. macropogon, 

 a somewhat transitional species, may be treated in one of four ways: it may remain in Lychno- 

 thamnus, be placed in Lamprothamnium, be separated in a genus Macropogon or be reinstated 

 in Chara. The author, after discussion, prefers the last alternative. Incidentally the new 

 combination Nitellopsis obtusa (Desv.) is made for Lychnothamnus stelliger Braun. — K. M. 

 Wiegand. 



697. Hatjman, L. Notes floristiques. Quelques cryptogames, gymnospermes et mono- 

 cotiledones de l'Argentine. [Floristic notes. Some Argentine cryptogams, gymnosperms and 

 monocotyledons.] An. Mus. Nacion. Hist. Nat, Buenos Aires 29: 391-444. PI. 1-4, fig. 1-3. 

 1917. 



BOTAXICAL ABSTRACTS, VOL. Ill, NO. 3 



