Lycopodiaceae

These plants are very old. They started growing long ago.

They do not have seeds. Instead, they make tiny dust. This dust can burn!

Some plants look like a wolf's paw. They can grow quite small. They are often found in mountains.

Small leaves cover their stems. These leaves can grow in rows. Some people use them for holiday decor.

These plants are a wonder of nature.

Clubmosses are a very old family of plants. They began about 380 million years ago. Some people call them "wolf foot." This is because their roots or tips look like a wolf's paw.

These plants do not make seeds. Instead, they make spores. Spores are tiny bits of dust. These spores are oily and can burn easily. People once used them as a flash powder. Violin makers even used them to fill small holes in wood.

The spores grow on a part called a strobilus. This is a special tip that looks like a tiny club. This shape gives the plants their name. Most clubmosses grow between 5 and 20 cm tall.

Each plant has small leaves called microphylls. These leaves have just one vein. They often cover the stem in rows or scales. Many of these plants live in mountains. They grow in many places around the world. However, they do not like very dry places. Some people use running clubmosses for Christmas decor.

Lycopodiaceae is a very old family of plants. These plants include core clubmosses and firmosses. They have about 17 different genera and 500 known species. Some people call them "wolf foot." This is because their roots or branch tips look like a wolf's paw. These plants are quite special because they are not spermatophytes. This means they do not produce seeds like many other plants. Instead, they make spores. These spores are oily and can burn very easily.

These plants grow in a very specific way. Each plant has a microphyll. A microphyll is a small leaf with just one vein. These leaves often cover the stem like tiny scales. Most clubmosses grow to be between 5 and 20 cm tall. The spores grow on a special structure at the top of a shoot. This part is called a strobilus. A strobilus looks like a tiny battle club. This shape is how the plants got their common name.

This plant family has a very long history. They first appeared about 380 million years ago in the early Devonian period. They split from other plants about 400 million years ago. Scientists believe the main group emerged by the Triassic-Jurassic boundary. That was about 200 million years ago. One member of the Lycopodioideae group was found in China during the Early Cretaceous.

Scientists study these plants to learn about the past. The family has three main subgroups. These are Lycopodielloideae, Lycopodioideae, and Huperzioideae. In 2016, researchers named these groups using a system called PPG I. Most species in this family have a chromosome count of n=34. However, the Diphasiastrum group is different. They have a count of n=23.

People have found many uses for these plants over time. Running clubmosses, or Diphasiastrum, are used as greenery for Christmas. The oily spores can be used as a flash powder. For centuries, violin makers used the spores to fill small pores in wood. In Cornwall, people once used club mosses as a remedy for eye disease. Most of these plants live in tropical mountains or alpine areas. They grow all over the world, but they do not live in dry places.

Lycopodiaceae is a diverse family of ancient vascular plants. This group includes all core clubmosses and firmosses. There are about 17 accepted genera and roughly 500 known species. These plants are not spermatophytes, meaning they do not produce seeds. Instead, they rely on spores for reproduction. Many people call them "wolf foot" because their roots or branch tips resemble a wolf's paw.

These plants have a unique physical structure. Every member of the family possesses a microphyll. A microphyll is a small leaf with a single vein. These leaves do not have a leaf gap in the central vascular system. Often, these microphylls densely cover the stem in a scale-like or spiral pattern. Most clubmosses grow to a height of 5 to 20 cm. They produce spores on a specialized structure at the shoot's apex called a strobilus. A strobilus looks like a tiny battle club, which is where the name "clubmoss" comes from.

The life cycle of Lycopodiaceae involves complex biological stages. The plants are isosporous, meaning they produce spores that are all the same size. These spores are oily and highly flammable. The gametophytes, or the stage of the life cycle that produces gametes, are often non-photosynthetic. Many species are myco-heterotrophic, meaning they get nutrients from fungi. However, some members of the subfamily Lycopodielloideae have green, photosynthetic upper parts. These parts connect to colorless lower parts that touch fungal hyphae.

Taxonomists use molecular phylogenetic studies to group these plants. Under the PPG I system, the family is divided into three subfamilies. These are Lycopodielloideae, Lycopodioideae, and Huperzioideae. The Huperzioideae are distinct because they produce spores in small lateral structures within leaf axils. Some scientists suggest this group should be its own separate family. Most species in the family have a chromosome count of n=34. An exception is the genus Diphasiastrum, which has a count of n=23.

The evolutionary history of this family is incredibly long. Lycopodiaceae originated about 380 million years ago during the early Devonian. They split from the branch leading to Selaginella and Isoetes about 400 million years ago. The subfamilies Lycopodioideae and Huperzioideae diverged about 350 million years ago. This group has evolved very slowly over time. About 30% of their genes remain in syntenic blocks, which means they stay in the same arrangement. They have also undergone independent whole genome duplications.

Evidence shows the crown group of Lycopodiaceae emerged by the Triassic-Jurassic boundary. This was approximately 200 million years ago. A member of the Lycopodioideae crown group was found in China during the Early Cretaceous. These plants are cosmopolitan, meaning they are found worldwide. They are most common in tropical mountain and alpine environments. However, they are generally excluded from arid or dry environments. They can grow as terrestrial plants or as epiphytes.

Humans have found several practical uses for these plants throughout history. The genus Diphasiastrum is often used as greenery for Christmas decorations. Because the spores are oily and flammable, they have been used as a flash powder. Violin makers have used these spores for centuries to fill pores in wood. In Cornwall, people historically gathered club mosses during certain lunar phases. They used the plants as a remedy for eye disease.