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Fucus virsoides J Agardh Detail of conceptacle with eggs Mid littoral zone Izola Slovenia 24 May 1998 Photographer Claudio Battelli © Claudio Battelli

The antheridia contain sperm or sperm progenitors The lighter stained thread like hairs are non ***ual they help retain moisture when the receptacle is exposed to dry conditions The female conceptacle is characterized by its large bulb shaped oogonia with egg or egg progenitor cells inside As in the male conceptacle sterile hairs protect against dessication

Melobesia membranacea Esper J V Lamouroux Lourido A Coruña Galicia Spain 2008 VSm conceptacle Photographer Ignacio Bárbara © Ignacio Bárbara

The male conceptacle above can be identified by the many small darkly stained antheridia The antheridia contain sperm or sperm progenitors The lighter stained thread like hairs are

12 Fucus Male conceptacle 13 Moss Protonema 14 Young Moss Gametophyte 15 Moss Female Gametophyte

Fucus sp recepticales Conceptacle of Fucus sp Conceptacle of Fucus sp

Cystoseira baccata S G Gmelin P C Silva ID No 40394 Lagoa Spain section through oogonial conceptacle Photographer Ignacio Bárbara © Ignacio Bárbara if you wish to use

9 Spirogyra Conjugation 10 Rhizopus Young Zygospore 11 Fucus Female Conceptacle 12 Fucus Male conceptacle

of branch showing apical pit filled with mucilage pink staining and dividing apical cell plastic embedded stained with Periodic Acid Schiff s reaction and aniline blue Eric Henry Oregon USA section through newly initiated conceptacle showing tongue cell borne on conceptacle initial plastic embedded stained with Periodic Acid Schiff s reaction and aniline blue

Cystoseira usneoides Linnaeus M Roberts conceptacle microscope Spain Galicia Ría de Betanzos 2007 Photographer Ignacio Bárbara © Ignacio Bárbara

10 Rhizopus Young Zygospore 11 Fucus Female Conceptacle 12 Fucus Male conceptacle 13 Moss Protonema

Click Here to see image Legend Monoecious conceptacle of Fucus Phaeophyta with antheridia and oogonia Keywords Phaeophyta oogonia antheridia conceptacle kelp Click Here to see image Legend Corallina Rhodophyta a lime encrusted red alga Keywords Rhodophyta lime algae reef formation

Click Here to see image Legend Macrocystis Phaeophyta sporophyte Monterey Bay California Keywords Phaeophyta sporophyte algae kelp Click Here to see image Legend Monoecious conceptacle of Fucus Phaeophyta with antheridia and oogonia Keywords Phaeophyta oogonia antheridia conceptacle kelp

is of tinsel type while the posterior longer flagellum if of whiplash type The nucleus is larger Chromatophore is reduced and posses an eye spot Oogonia Only a few oogonia are borne in a conceptacle They are formed directly from the cells of the fertile layer very early in the development

8 Spirogyra Vegetative 9 Spirogyra Conjugation 10 Rhizopus Young Zygospore 11 Fucus Female Conceptacle

receptacles eggs and sperm on same plant and on same reproductive structure Summary of Basic Life Cycle Fertile branches of adult algae produce gametes see Morphology When the ova are squeezed out of the conceptacle they are not broadcast

Conceptacle of Fucus sp Conceptacle of Fucus sp Fucus sp Male concepticle with antheridia Next page

These are all marine forms many of great size reaching a length in some cases of a hundred metres or more and showing a good deal of differentiation in their tissues and organs Fig 26 A a branch of common rock weed Fucus one half natural size x end of a branch bearing conceptacles B section through a conceptacle containing oögonia og × 25 C

Corallina elongata J Ellis Solander Mediterranean Conceptacle Photographer Mirella Coppola di Canzano © University of Trieste Bressan G Babbini L 2003 Biodiversità marina delle coste Italiane Corallinales del

11 Fucus Female Conceptacle 12 Fucus Male conceptacle 13 Moss Protonema 14 Young Moss Gametophyte