Of _the Lichens_ much less is known, only sixty-seven species having been recorded. The most noteworthy are _Calicium melanophaeum_, found on fir-trees in Bricket Wood; _Peltigera polydactyla_, on moss-covered ground in Oxhey Woods, Watford; _Lecanora phlogina_, in the Tunnel Woods, Watford; and _Pertusaria globulifera_, on trees in the same woods and also in Bricket Wood. As woods in the vicinity of Hertford and of Watford only have been searched for lichens, our list ought to be largely increased by investigation in other parts of the county. Of _the Fungi_ our chief knowledge is derived from lists of species collected at Fungus Forays of the Hertfordshire Natural History Society and from records of the Mycetozoa by Mr. James Saunders. The number of species recorded for the county is 735, of which fifty-eight are "myxies". Of the Hymenomycetes, or mushroom-like fungi, some very noteworthy finds have been made, nearly all at Forays of the county society. They include two species new to Britain, _viz._, _Agaricus (Nolania) nigripes_, found in Aldenham Woods, Watford, and _Ag. (Hypholoma) violacea-ater_, in Gorhambury Park, St. Albans (by the present writer). Hertfordshire has also furnished the second British records for _Ag. (Lepiota) gliodermus_ (Broxbourne Woods), _Ag. (Leptonia) euochrous_ (Ashridge Woods), _Ag. (Psathyrella) aratus_ (Sherrard's Park, Welwyn), and _Paxillus Alexandri_ (Hatfield Park), this species having first been recorded from Hatfield Park, Essex; and the second and third British record for _Agaricus (Clytocybe) Sadleri_ (Ashridge Park and Cassiobury Park). The very rare _Strombilomyces strombilaceus_ has been found in Grove Park, Watford, and the still rarer _Peziza luteo-nitens_ on the Chalk slopes between Aldbury and Ashridge Park. Lastly it may be mentioned that Mr. Saunders added the "myxie" _Physarum citrinum_ to the British fungus-flora from specimens found by him at Caddington and Welwyn.