Referring Clues

• Tiny aquatic plant
• Foot of a food chain
• Chlorophyta bit
• Stonewort, e.g.
• Marine ___
• Water growth
• Bit of plankton
• Microscopic organism
• Pond dweller
• Bit of ocean flora
• Pond organism
• Bit of seafloor flora
• Morsel for a sea snail
• Seaweed, for one
• Sea moss constituent
• Red ___ (marine plant)
• Aquatic plant
• Pond floater
• Eukaryotic organism
• Lowlife?
• It lacks roots
• Green ___ (spirogyra, e.g.)
• Tiny organism
• Aquarium growth
• Pond plant
• Sea lettuce, e.g.
• Bit of scum
• Chlorophyll-containing microorganism
• Kelp, for one
• Bit of aquarium growth
• Aquatic organism
• Blue-green birdbath bit
• Pond growth
• Unwanted plant in a pool
• Sargassum, for one
• Bit of pond scum
• Chlorophyllous plant
• Lichen component
• Kelp, for example
• Plantlike organism
• Seaweed, e.g.
• Seaweed
• Frog spit, for example
• Plankton, e.g.
• Plankton
• Birdbath bit
• Pond film
• Piece of pond scum
• Piece of scum
• Fish tank organism
• Marine plant
• Pond scum organism
• Plankton component
• Frog spit, e.g.
• Tiny pond plant
• Chlorophyll-containing organism
• Spirulina, e.g.
• Unwanted organism in an aquarium
• Sea grass, e.g.
• Certain prokaryote
• Water silk, e.g.
• Rootless plant
• Pool microorganism
• Bit of phytoplankton
• Lake organism
• Pool problem
• Microscopic pond organism
• Oxygen releaser
• Simple organism
• Unwanted aquarium organism
• Some plankton
• Bit of ocean life
• Birdbath organism
• Aquarium dweller
• Primitive water organism
• Kelp, e.g.
• Chlorophyll plant
• Tiny pond organism
• Marine growth
• Rootless water life
• Pond scum component
• Part of a pond problem
• Simple water dweller
• It creates energy through photosynthesis
• Bit of rootless flora
• Bit of aquarium gunk
• Pond scum
• Plant that's often pluralized
• Lake plant
• Pool organism
• Spirogyra, e.g.
• Pond problem
• Pool life form
• Aquatic organisms
• Fish food
• Part of many a snail's diet
• Stagnant water problem
• Agar extract
• Aquarium organism
• Mussel morsel
• Unwanted swimming pool bit
• Plankton part
• Agar source
• Unwanted aquarium collection
• Pond life form
• Tiny organism that's often pluralized
• Bit of pond vegetation
• Plankton minutia
• Bio fuel source
• Morsel for a guppy
• Film bit
• Anabaena or chlorella
• Minuscule lake plant
• Stagnant water growth
• Bit of stagnant-water growth
• Chlorophyllous organism
• Rootless pond growth
• Bit of seaweed
• Aquarium annoyance
• Bit of kelp, e.g.
• Simple aquatic plant
• Microscopic pond life
• Plankton piece
• Blue-green plant
• Bit of kelp, say
• Pond annoyance
• Bit of marine life
• Fishtank organism
• Bit of fish food
• Minuscule lake organism
• Tiny tank plant
• Bit of pond slime
• Tiny aquatic organism
• Reef denizen
• Bit of 19-Across flora
• Bit of birdbath gunk
• Simple marine plant
• Wee bit of marine life
• Small bit of rootless flora
• Fountain growth
• Bit of 30-Down life
• Bit of fish tank growth
• Bit of chlorophyta
• Tiny lake organism
• Pond scum source
• Aquarium problem
• Snapper's snack
• Pond life
• Seaweed component
• Fragment of pond scum
• Simple aquatic organism
• Green organism
• Bit of sea flora
• Blue-green growth
• Plankton morsel
• Plant such as seaweed
• Primitive aquatic plant
• Primitive plant
• Seafood's special gastronomic ingredient
• Seaweed plant
• Primitive non-flowering, mainly aquatic, plant
• Seaweed included in botanical garden
• Sargassum, e.g.
• Photosynthesizing aquarium denizen
• Component of a lichen
• Phycological unit
• Oyster thief or mermaid's wineglass, e.g.
• Pond-scum ingredient
• Bit of aquatic life
• Tiny pond growth
• Sea growth
• Nonflowering plant
• Bit of aquarium residue
• Seaweed from a coastal garden
• Latin word for "seaweed"
• Pool growth
• Stonewort specimen
• Bit in a fish tank
• Sea lettuce, for one
• Aquarium slime
• Word from the Latin for "seaweed"
• Simple plant
• Rootless thing in a pond
• Rockweed
• Kelp bit
• Plant in a pond
• Seaweed in the National Gallery
• Bit of fish tank gunk
• Bit of pond growth
• Fish tank growth
• It helps turn a pond green
• Fish food plant
• Plant that lacks true roots and leaves
• Plant used in making biofuel
• Unusually singular plant in Trafalgar Square
• Low life?
• Floating sea plant
• Growth in an aquatic bloom
• Bit of film
• Chlorophyte, e.g.
• Rootless water plant
• Simple pond organism
• Plant in a bloom