| algae | | |
| n. (animal) | 1. alga, algae | primitive chlorophyll-containing mainly aquatic eukaryotic organisms lacking true stems and roots and leaves. |
| ~ protoctist | any of the unicellular protists. |
| ~ seaweed | plant growing in the sea, especially marine algae. |
| ~ golden algae | algae having the pigments chlorophyll and carotene and xanthophyll. |
| ~ yellow-green algae | any alga of the division Chrysophyta with its chlorophyll masked by yellow pigment. |
| ~ diatom | microscopic unicellular marine or freshwater colonial alga having cell walls impregnated with silica. |
| ~ confervoid algae | algae resembling confervae especially in having branching filaments. |
| ~ brown algae | algae having the chlorophyll masked by brown and yellow pigments. |
| ~ euglenid, euglenoid, euglenophyte | marine and freshwater green or colorless flagellate organism. |
| ~ chlorophyte, green algae | algae that are clear green in color; often growing on wet ricks or damp wood or the surface of stagnant water. |
| ~ chlorella | any alga of the genus Chlorella. |
| ~ red algae | marine algae in which the chlorophyll is masked by a red or purplish pigment; source of agar and carrageenan. |
| ~ cryptomonad, cryptophyte | common in fresh and salt water appearing along the shore as algal blooms. |
| lichen | | |
| n. (state) | 1. lichen | any of several eruptive skin diseases characterized by hard thick lesions grouped together and resembling lichens growing on rocks. |
| ~ disease of the skin, skin disease, skin disorder | a disease affecting the skin. |
| ~ lichen planus, lichen ruber planus | an eruption of shiny flat-topped purplish (usually itchy) papules on the wrist and forearms and thighs. |
| n. (plant) | 2. lichen | any thallophytic plant of the division Lichenes; occur as crusty patches or bushy growths on tree trunks or rocks or bare ground etc.. |
| ~ division lichenes, lichenes | comprising the lichens which grow symbiotically with algae; sometimes treated as an independent group more or less coordinate with algae and fungi. |
| ~ ascolichen | a lichen in which the fungus component is an ascomycete. |
| ~ basidiolichen | a lichen in which the fungus component is a basidiomycete. |
| ~ lecanora | any lichen of the genus Lecanora; some used in dyeing; some used for food. |
| ~ roccella, roccella tinctoria | a source of the dye archil and of litmus. |
| ~ beard lichen, beard moss, usnea barbata | greenish grey pendulous lichen growing on trees. |
| ~ horsehair lichen, horsetail lichen | any of several lichens of the genus Alectoria having a thallus consisting of filaments resembling hair. |
| ~ arctic moss, cladonia rangiferina, reindeer lichen, reindeer moss | an erect greyish branching lichen of Arctic and even some north temperate regions constituting the chief food for reindeer and caribou and sometimes being eaten by humans. |
| ~ crotal, crottal, crottle | any of several lichens of the genus Parmelia from which reddish brown or purple dyes are made. |
| ~ cetraria islandica, iceland lichen, iceland moss | lichen with branched flattened partly erect thallus that grows in mountainous and Arctic regions; used as a medicine or food for humans and livestock; a source of glycerol. |
| ~ fungus | an organism of the kingdom Fungi lacking chlorophyll and feeding on organic matter; ranging from unicellular or multicellular organisms to spore-bearing syncytia. |
| moss | | |
| n. (plant) | 1. moss | tiny leafy-stemmed flowerless plants. |
| ~ bryophyte, nonvascular plant | any of numerous plants of the division Bryophyta. |
| ~ acrocarp, acrocarpous moss | a moss in which the main axis is terminated by the archegonium (and hence the capsule). |
| ~ pleurocarp, pleurocarpous moss | a moss having the archegonium or antheridium on a short side branch rather than the main stalk. |
| ~ bog moss, peat moss, sphagnum, sphagnum moss | any of various pale or ashy mosses of the genus Sphagnum whose decomposed remains form peat. |
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