UNIVERSITY OF CALIFORNIA PUBLICATIONS 



IN 



BOTANY 



Vol. 6, No. 18, pp. 487-496, plate 42 January 4, 1919 



NEW PACIFIC COAST MARINE ALGAE IV 



BY 

 NATHANIEL LYON GAEDNER 



Anabaena propinqiia Setchell et Gardner sp. nov. 



Plate 42, fig. 1 



Strato teimissimo. laete coenilpo-viridi ; triehomatibiis flexnosis. 

 2.6-3/x diam., vauinis distincti.s; celliilis siibquadratis, 1.8-3/i, loiigis, 

 eylindricis. ad dissepimenta conspicua leviter constrictis ; cellulis 

 terminalibns obtiisis aiit acute conieis; heterocystis snbsphaerieis ant 

 eylindricis, 3.5— 4.5;a cras.sis. 5-7 fx longis; sporis snbsphaerieis ant late 

 elliptieis, 5.5-7;u crassis. T-O/x longis, catenatis. ab heterocystis reniotis 

 evolntione centrifuga. membrana externa levi. hyalina. 



Stratnm very thin, light bine-green ; trichomes flexnons. 2.6-3/x 

 diam., with a distinct sheath; cells snbqnadrate. 1.8-3/x long, cylin- 

 drical, slightly constricted at the dissepiments which are very distinct ; 

 terminal cells varying from blnnt to acnte conical ; heterocysts snb- 

 spherical to cylindrical. 3.5-4.5(U, diam., 5-7 /a long; spores snbspherical 

 to broadly ellipsoidal, 5.5-7/i. diam., 7-9/Lt long, catenate, remote from 

 the heterocysts. developing centrifngally, membrane smtwth, hyaline. 



Forming a thin stratnm, more or less eontinnous, on Biippia 

 mnritimn. Tn pools in a salt marsh, West Berkeley, California. Type 

 no. 1423, Gardner. 



Anabaena variahilis Collins, Holden & Setchell, Phyc. Bor.-Amer. 

 (Exsicc), no. 1209. 



Anabaena propinqua appears to be closely related to A. variabilis 

 Kuetz., but eon^parison with authentic material of that species from 

 the herbarinm of Thnret contributed by Dr. Bornet (Herb. I"^niv. Calif, 

 no. 100300) shows sufficient differences to warrant the establishment 

 of a new species to receive our plant. Tt differs from A. variabilis 

 Kuetz. in the .smaller dimensions of all parts of the plant, vegetative 

 cells, heterocysts and spores, which are also more nearly spherical than 

 in A. variabilis and have hyaline walls instead of brown as in that 

 species. 



urn: . . 

 80 Tan* V 



:n. 



