i922] Setchell-Gardner : PJujcological Contnhutions 341 



Mjrrionema balticum f. pedicellatum forma nov. 



Plate 33, figures 11, 12 



Frondibiis pulvimilos mieroseopieos 150-400/x (usque ad 800/x) 

 diam., linea exteriore maxime irregiilares formantibiis ; filamentis 

 ereetis pro parte brevi pilif eris, 140-160^ longis ; pilis veris ignotis ; 

 zoosporangiis( ?) angiiste clavatis, in filamentis repentibiis sessilibus 

 aiit in filamentis ereetis terminalibiis ; gametangiis in pedicellis cellulis 

 10-15^u compositis suffnltis terminalibus aut sessilibus, usque ad 150/* 

 longis. 



Growing on the outer ends of the leaves of Phyllospadix sp. Point 

 Carmel, Monterey County, California. Type, Setchell, no. 5417 (Herb. 

 Univ. Calif., no. 207030), June. 



This form differs from the species in the absence of hairs, in having 

 a few very short-piliferous, vegetative filaments, and in having the 

 gametangia on long pedicels. 



In this form, as in many others, the correct interpretation of the 

 zoosporangia mentioned above in the diagnosis is an open question. 

 They are filled with dense cell contents, and, although none have been 

 observed to produce zoospores, they appear as though they might later. 

 Whatever their nature may finally prove to be. they represent another 

 character in which this form differs from the species. Reinke neither 

 figures nor describes them in Ascocyclus halticus. They appear on 

 the same individuals with the gametangia or on different individuals. 



Myrionema balticum f . californicum forma nov. 



Frondibus pulviniTlos microscopicos. 0.5-0.75 mm. diam. ; parte 

 prostrata filamentis relative rectis, regulariter radiantibus composita ; 

 filamentis ereetis simplicibus. et superne et infeme leviter attenuatis, 

 obtusis. 75-125/A longis; pilis veris 0.5-1 mm. longis; cellulis fila- 

 mentorum prostratorum 6-7/* diam., 1-1.5-plo longioribus: cellulis 

 filamentorum erectorum 7.5-10/i diam., quadratis; cellulis pilorum 

 verorum 4-5. 5/t diam., superne 6-10-plo. longioribus, basi 3-5-plo 

 longioribus, sed cellulis paucis basim superne remotis quadratis; 

 chromatophoris taeniatis irregulariter interruptis ^ compositis ; zoo- 

 sporangiis ignotis; gametangiis pedicellis 1-3 cellulis compositis 

 suffultis, aut e filamentis repentibus aut e basibus filamentorum erec- 

 torum lateralibus oriendis, cylindricis, 90-130/* longis, 7-9/* latis. 



Growing on the outer ends of the leaves of Phyllospadix sp. Point 

 Carmel, Monterey County. California. Type, Setchell, no. 5439 (Herb. 

 Univ. Calif., no. 207031), June. 



We have no authentic measurements of Ascocyclus halticus Reinke. 

 He does not mention the size of the gametangia either in the Atlas 



