6 Written Questions
5 Multiple Choice Questions
thallus is a light to medium brown blade that tapers below to a tiny discoidal holdfast but lacks the complex cell differentiation of true kelps. The blade is thinner than kelps, and the margins are smooth. The thallus can grow up to 35 cm tall.
Found growing on rock in the mid intertidal to shallow subtidal
Life History: Heteromorphic and diphasic alternation between erect gametophytes and discoid sporophytes
Cells are normally as broad as they are long
Habitat: attached to surfaces by a modified holdfast cell
Thrive in the low temperatures of spring and winter
Life History: Reproduction in Ulothrix takes place by means of vegetative, asexual and sexual methods
Demonstrates dichotomous branching in one plane with a narrow stalk that ends in a discoid. The thallus is flattened with an evident percurrent midrib.
Habitat: abundant in the high intertidal zone, commonly settling on stationary rocky substrate
Life History: diplontic life history with no free-living haploid state. The adult sporophyte has a flattened thallus that terminates with the fertile receptacle, which contains conceptacles, which produce the oogonia and antheridia
Thallus is a delicate, uniseriate filament, reaching 15 cm tall. Microscopic branches are opposite, usually short and unbranched, with squarish basal cells. The branch tip is somewhat curved
Habitat: ephemeral seaweed grows on rock and epiphytically in the low intertidal and subtidal of semi-protected to exposed habitats
Life History: Three stages are the tetrasporophyte, the dioecious gametophyte stage, and the carposporophyte stage
The sporophyte and gametophyte are isomorphic
filaments have hooks that cause the branches to become tangled.
Habitat: intertidal, often in pools
Epizoic growth very common
Life History: heteromorphic - the gametophyte is macroalgae
*Distinguishing between Acrosiphonia coalita and Acrosiphonia arcta is very difficult in the field. For Acrosiphonia coalita, It is generally dark green in color.
5 True/False Questions
Filamentous and usually well branched some plants reaching a length of about 30 cm
Thallus (tissue) consists of fine-branched filaments each with a central axial filament supporting pericentral cells
Attached by haptera to rock or other organisms in the low intertidal to subtidal
Life History: consists of a sequence of a gametangial, carposporangial and tetrasporangial phases
Description: green, eel grass
Vascular plant containing true roots, stem, blade
Found growing in the muddy or sandy substrate of the shallow sub-tidal
Life History: reproduce by means of vegetative propagation, where the plant sends out rhizomes (horizontal, underground stems) that send up new shoots of seagrass
Thallus is rose red (bleaching to yellow later in season), somewhat crisp, reaching 60 cm tall and 20 cm wide. The blade is usually undivided, rounded at the top, perforated with small holes, tapering rapidly to a stipe and attached to a small discoidal holdfast. Cystocarps occur as small dark bumps on blade surface
Found on rock in the low intertidal and subtidal
Arises from a discoid holdfast and short stipe. Unbranched, erect thalli forming initially uniseriate filaments becoming multiseriate at maturity
Habitat: forming dense clumps or mats, and occur throughout the intertidal area and subtidally. Usually attached to a solid substratum but can also occur as epiphytes.
Life History: heteromorphic alternation of generation life cycle in which the haploid generation is dominant.
Encrusting coralline →
Description: red, coralline
Thallus that is hard because of calcareous deposits contained within the cell walls and can be divided into three layers: the hypothallus, perithallus and epithallus
Habitat: Low intertidal to subtidal
Many are epiphytic (grow on other algae or marine angiosperms), or epizoic (grow on animals), and some are even parasitic on other corallines