Morphology and life history of Scytosiphon lomentaria (Scytosiphonaceae, Phaeophyceae) from the Azores

Manuela Isabel Parente, Ana Isabel Neto, Robert Lawson Fletcher

Research output: Contribution to journalArticlepeer-review


Morphological and culture studies of Scytosiphon lomentaria (Lyngbye) Link and Microspongium gelatinosum Reinke (Scytosiphonaceae, Phaeophyceae) were undertaken on material collected on the Island of São Miguel, Azores, where both species were commonly found. Erect thalli of S. lomentaria collected in the field were up to 33 cm long and 2.3 mm wide, tubular, hollow, and commonly constricted at intervals. The plurilocular sporangia were positioned in continuous sori on the thallus surface. Ascocysts were present. In the field, M. gelatinosum formed crustose to slightly pulvinate plants, were spongy in texture, and dark brown to black in color, which were circular or irregularly spreading over several centimeters and firmly attached to the substratum. Sessile unilocular sporangia were located in sori on the crust surface. In culture S. lomentaria plurispores developed into Microspongium‐like crustose prostrate thalli that formed unilocular sporangia. Unispores developed into new erect thalli that formed plurilocular sporangia. Sexual reproduction was not observed. In culture, M. gelatinosum unispores developed into erect thalli identical with S. lomentaria. These results are similar to those reported for other areas and suggest the occurrence in the Azorean plants of a monophasic and heteromorphic life history, involving both entities studied.
Original languageEnglish
Pages (from-to)353-359
JournalJournal of Phycology
Issue number2
Early online date28 Mar 2003
Publication statusPublished - 1 Apr 2003


Dive into the research topics of 'Morphology and life history of Scytosiphon lomentaria (Scytosiphonaceae, Phaeophyceae) from the Azores'. Together they form a unique fingerprint.

Cite this