342 TJniversitij of California Publications in Botany l^^ou 7 



(1889, })!. 16, figs. 1-4), where he first describes and figures it. or in 

 the Algenfiora (1889a, p. 45) where he describes it again. Foslie 

 (1894, p. 17, repr.) made the combination Myrionema (Phycocelis) 

 halticum, but he gave no measurements for any of its parts. De-Toni 

 (1895, p. 581) lists the plant as Phycocelis(f) haltica (Reinke) Foslie, 

 but gives no additional information concerning the size of the game- 

 tangia. Kylin (1907, p. 35) lists a plant under Myrionema halticum 

 (Rke.) Fosl. which he found growing on Delesseria sangiiinea at 15 M. 

 depth. lie states that the assimilation filaments are 100-125)li long 

 and 4-6/x broad, but gives no measurements for the gametangia. 



The plant which we have diagnosed here is doubtless very closely 

 related to Reinke 's Ascocyclus halticus. It may be a distinct species, 

 but we are listing it as a form of halticus until we can obtain more 

 knowledge of its variation, and more authentic information concerning 

 the type material of halticus. Tlie particular distinguishing character 

 is the very frequent occurrence of lateral gametangia arising very 

 close to the base of the vegetative filaments. 



Myrionema globosum f. affine forma nov. . 



Plate 33, figure 16 



Frondibus microscopicis, 200-300/i, diam., linea exteriore irrecru- 

 laribus, algis alteris parvis immixtis; filamentis prostratis multo dis- 

 tortis, libera ramosis; filamentis erectis fasciculato-ramosis, 100-140// 

 longis, superne attenuatis, pro parte piliferis; pilis veris 300-400/^ 

 longis; cellulis filamentorum prostratorum 4-6/i diam., forma varia- 

 bilibus; cellulis filamentorum erectorum cylindrieis, 4-5ju, diam.; zoo- 

 sporangiis ignotis; gametangiis cylindrieis, 35-45/x longis, 4— 4.5ju, latis, 

 in filamentis erectis sessilibus lateralibusque aut raro terminalibus; 

 loeulis uniseriatis. 



Growing on the leaves of eel-grass. Sitka, Alaska, to central Cali- 

 fornia (Point Carmel. Monterey County). Type, Setchell. no. 5439a 

 (Herb. Univ. Calif., no. 207032), Point Carmel, June. 



"We have no measurements in detail for the parts of Myrionema 

 glohosnm, this seemingly distinct species. Reinke (1889a, p. 46) states 

 that the plants are one-half to one millimeter in diameter. Our plants 

 seem much smaller, in general. It is difficult to make out the size on 

 account of their being so intimately intermixed with other small algae. 

 This is the case in both collections of plants w^hicli we have examined, 

 one from Sitka, Alaska, and the other from Point Carmel, California. 

 We are placing it as a form of M. glohosnm (Reinke) Foslie, awaiting 

 knowledge of further details concerning the type. 



