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. 
CYANOPHYCE: 
Nostoc commune, Vauch. Common 
— pruniforme, C. Ag. On the heath in 
Wrest Park 
Aphanizomenon Flos-aquz, Ralfs. Com- 
mon 
CHLOROPHYCEZE 
Spirogyra porticalis, Vauch. Common 
Hydrodictyon reticulatum, Lagerh. Wo- 
burn, Aspley 
Enteromorpha intestinalis, Link. Common 
Trentepohlia aurea, C. Ag. Barton Hill 
Cladophora canalicularis, Kttz. Mill- 
ponds, ‘common 
— fracta, Kitz. Common 
— glomerata, Kutz. 
Vaucheria sessilis, D., var. caspitosa, 
Cooke. Rare; Luton Hoo 
RHODOPHYCE/E 
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 fracta 
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)' 
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. 
Keerb. 851 Calicium hyperellum, Ach. (?) 
The Lichen flavus of old authors apparently included the sterile 
thalli of several lichens. _C. Aypere/lum, common on old oaks, is probably 
the species intended by Abbot, as he mentions that Lichen flavus grows 
‘on oak barks.’ 
868 Bzomyces rufus, DC. 906 = Cladonia coccifera, Scher. 
869 — roseus, Pers. 903 f. cornucopioides, Fr. 
867 — icmadophilus, Ehrh. 908 Cladina rangiferina, Nyl. 
g05 Cladonia alcicornis, Floerke 909 — uncialis, Nyl. 
ial = pydaia, Fr. i son ie see We Nyl. 
— farinacea, Ach. 
go2 — fimbriata, Fr. 892 — fraxinea, "Ach. 
904 f, exigua, Cromb. g10_ Usnea hirta, Hoffm. 
907 var. subcornuta, Nyl. gi1 Alectoria jubata, Nyl. 
1 Revised by E. M. Holmes, Curator of the Museums of the Pharmaceutical Society of Great 
Britain. 
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