A HISTORY OF BEDFORDSHIRE good enough to revise Abbot's list. In modern nomenclature it appears therefore that the following species were noted by that investigator. CYANOPHYCEiE Enteromorpha intestinalis, Link. Common Nostoc commune, Vauch. Common Trentepohlia aurea, C. Ag. Barton Hill — pruniforme, C. Ag. On the heath in Cladophora canaliculars, Kutz. Mili- um/ Park P onds » common Aphanizomenon Flos-aqua, Ralfs. Com- — facta, Kutz. Common m0 n — glomerate, Kite. Vaucheria sessilis, D., var. caespitosa, CHLOROPHYCEjE Cooke. Rare ; Luton Hoo Spirogyra porticalis, Vauch. Common RHnnnPHYPF^ Hydrodictyon reticulatum, Lagerh. Wo- KHUUUhHYttA burn, Aspley Batrachospermum moniliforme, Roth. With regard to Conferva bullosa, Vaucheria sessilis (Conferva amphibia), and Spirogyra porticalis [Conferva rivularis), Mr. Holmes remarks that he does not positively identify the species, but has compared the references with the illustrations given by Dillenius (as quoted in Abbot's work) but the illustrations do not show any structural details. As regards Conferva bullosa, concerning which Abbot says, ' threads matted, enclos- ing bubbles of air,' Mr. Holmes remarks, ' I have seen Cladophora fr acta lifted to the top of the marsh ditches by gas given off by the weed in sunshine, and there could be no other alga of a bright green colour grow- ing in the situations described and in matted tufts that does the same.' The Vaucheria is stated by Abbot to grow on damp walls, but Mr. Holmes says it is found in spring time in runnels of water at the foot of damp walls by farmhouses, etc. Abbot's description of the branches unit- ing into points when dry exactly applies to it. The Spirogyra named is most likely the one intended, but the structure is not given by Dillenius. THE LICHENS (Lichenes) 1 In this section we have also to rely upon the observations of Abbot and the revision by Mr. E. M. Holmes. In the following list the numbers refer to the records in the Flora Bedfordiensis. 879 Collema tenax, Ach., var. coronatum, 896 Collema nigrescens, Ach. Koerb. 851 Calicium hyperellum, Ach. (?) The Lichen flavus of old authors apparently included the sterile thalli of several lichens. C. hyperellum, common on old oaks, is probably the species intended by Abbot, as he mentions that Lichen favus grows ' on oak barks.' 868 Baeomyces rufus, DC. 906 Cladonia coccifera, Schaer. 869 — roseus, Pers. 9°3 f. cornucopioides, Fr. 867 — icmadophilus, Ehrh. 908 Cladina rangiferina, Nyl. 905 Cladonia alcicornis, Floerke 909 — uncialis, Nyl. 900I 901/ — pyxidata, Fr. 886 891 Ramalina calicaris, Nyl. — farinacea, Ach. 90a — fimbriata, Fr. 892 — fraxinea, Ach. 904 f. exigua, Cromb. 910 Usnea hirta, Hoffm. 907 var. subcornuta, Nyl. 911 Alectoria jubata, Nyl. 1 Revised by E. M. Holmes, Curator of the Museums of the Pharmaceutical Society of Great Britain. 60
