176 MORPHOLOGY AND TAXONOMY, ALGAJB [Box. Absts., Vol. VIII, 



pure acetone and then to a 12 per cent solution of cellulose acetate in acetone. By this 

 method they are not only imbedded but also softened. Woods such as oak or beech are 

 sufficiently softened for sectioning after 6 days in the solution.— WT. P. Thompson. 



1220. WissELiNCH, C. VAN. Bijdragen tot de Kennis van de Zaadhuid. Achtste bijdrage: 

 Over de Zaadhuid bij de orde der Centrospermae. [Contribution to a knowledge of the seed- 

 coat. Eighth contribution: The seed-coat of the Centrospermae.] Pharm. Weekbl. 57: 1193- 

 1211. PL 1, fig. 10. 1920. — In the campylotropic ovule of the Centrospermae 3 cuticles can 

 be distinguished, 1 on the epidermis, 1 between the 2 integuments, and 1 between the inner- 

 most integument and the nucellus. During the development of the ovule into the seed in 

 some cases (Caryophyllaceae) the cuticle on the epidermis disappears; in other cases (Beta 

 vulgaris, Amaranthus caudatus, Portulaca grandiflora) the cuticle between the 2 integimaents 

 is lost, either partly or altogether. The cuticle between the seed-coat and the nucellus 

 remains and becomes rather thick. In the chalaza a cork-tissue is developed, which borders 

 the thick cuticle between the seed-coat and the nucellus but which differs from other chalaza 

 cork tissues in that the cork-cells are thickened at the corners (Beta vulgaris) or in that the 

 cell-walls are covered with a cutin-like substance. — H. Engelhardt. 



MORPHOLOGY AND TAXONOMY OF ALGAE 



E. N. Transeau, Editor 

 (See also in this issue Entries 932, 933, 1291, 1360) 



1221. Bristol, B. Muriel. On a Malay form of Chlorococcum humicola (NSg.), Rabenh. 

 Jour. Linn. Soc. Bot. London 44: 473^82. PI. 17-18. 1920.— The author describes an alga 

 obtained by culture from a sample of soil from Kuala Lumpur that had been dry for two 

 years. Reproduction by zoospores, which may also act as gametes, was observed. Aplano- 

 spores are formed which germinate and produce a palmella-stage, and these cells produce 

 the usual vegetative cells directly, or indirectly by means of zoospores. In dried soil samples 

 Chlorococcum has been known to retain its vitality more than 70 years.— ^. N. Transeau. 



1222. Bristol, B. Muriel. A review of the genus Chlorochytrium, Cohn. Jour. Linn. 

 Soc. Bot. London 45: 1-28. PL 1-3, fig. 1. 1920.— In continuation of the work of G. S. 

 West in submerging 6 genera into the genus Chlorochytrium, this paper contains a critical 

 discussion of the present limits of the genus and the criteria that may be used to define 

 species. As a result of further study of the morphology of these forms, 10 well-defined and 3 

 doubtful forms are included in the genus. The recognized species are: Chlorochytrium 

 Lemnae Cohn; C. bienne (Klebs) G. S. West; C. paradoxum (Klebs) G. S. West; C. Facciolaae 

 (Borzi) Bristol, and var. minor (Borzi) Bristol; C. grande Bristol; C. Limnanthemum (D.D. 

 Cunningh.) G. S. West; C. inclusum Kjellman, and var. dermatocolax (Reinke) Bristol; C. 

 Sarcophyci (Whitting) G. S. West; C. Cohnii E. P. Wright, and var. Porphyrae (Gardner) 

 Bristol; and C. Moorei Gardner. The doubtful forms are C. laetum Schroeter, C. viride 

 Schroeter, and C. rubrum (Schroeter) Freeman.—^. N. Transeau. 



1223. Britton, Nathaniel Lord, and Charles Frederick Millspaugh. The Bahama 

 Flora. Roy.Svo., viii-\-695 p. Published by the authors: New York, June 26, 1920.— See 

 Bot. Absts. 7, Entry 1429. 



1224. Conrad, W. Contributions a I'etude des Chrysomonadines. [Contributions to the 

 study of the Chrysomonads.] Bull. Acad. Roy. Belgique, CI. Sci. 1920^-^: 167-189. 11 fig. 

 1920.— The author takes up first Synura Uvella Ehr., and brings together his own observa- 

 tions and those of others on the cell, its division, and the formation of colonies. Thallo- 

 chrysis Pascheri is described as a new genus and species, the type of a new family, the Thallo- 

 chrysidaceae. The taxonomic characters of Chrysapsis sphagnorum n. sp. and other indigenous 

 species of Chrysapsis are given. — Henri Micheels. 



